Page 1 of 12
                                                         Exhibit Index on Page 2

                                   FORM 11-K

                                 UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


Annual Report Pursuant to Section 15(d) of the Securities Exchange Act
of 1934




(Mark One)

  [X]   ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES
        EXCHANGE ACT OF 1934.
             For the fiscal year ended:  December 31, 1999

  OR

  [ ]   TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE
        ACT OF 1934.
             For the transition period from       to



Commission file number     1- 3208

  A.    Full title of the plan and the address of the plan, if
        different from that of the issuer named below:

        National Service Industries Retirement and 401(k) Plan


  B.    Name of issuer of the securities held pursuant to the plan and
        the address of the principal executive office:

        National Service Industries, Inc.
        1420 Peachtree Street, NE
        Atlanta, Georgia 30309



Page 2

REQUIRED INFORMATION

The following documents are filed as a part of this report:

1.   Financial Statements


     Plan  financial  statements  prepared  in  accordance  with  the  financial
     reporting requirements of ERISA include the following:

     Report of Independent Public Accountants

     Statements of Net Assets Available for Benefits as of December 31, 1999 and
     1998

     Statement  of Changes  in Net  Assets  Available  for  Benefits for the
     Year Ended December 31, 1999

     Notes to Financial Statements

2.   Exhibits
                                                             Sequentially
                                                               Numbered
     The following exhibit is filed with this report:            Page

     23     Consent of Arthur Andersen LLP                        12



SIGNATURES

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
trustees (or other persons who administer  the employee  benefit plan) have duly
caused this annual report to be signed on its behalf by the undersigned hereunto
duly authorized.

                              National Service Industries Retirement
                              and 401(k) Plan


Date: June 28, 2000           By:   National Service Industries, Inc.
                                    Plan Administrator

                              By:    /s/ James S. Balloun
                              Name:  James S. Balloun
                              Title: Chairman and Chief Executive Officer


                                                                          Page 3

                          National Service Industries
                           Retirement and 401(k) Plan



                              Financial Statements
                        as of December 31, 1999 and 1998
                         Together With Auditors' Report


REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS



To the Plan Administrator of
National Service Industries
Retirement and 401(k) Plan:


We have audited the accompanying statements of net assets available for benefits
of National  Service  Industries  Retirement  and 401(k) Plan as of December 31,
1999 and 1998 and the related  statement of changes in net assets  available for
benefits for the year ended December 31, 1999.  These  financial  statements are
the responsibility of the Plan's management. Our responsibility is to express an
opinion on these financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. Those standards require that we plan and perform the audit
to obtain reasonable  assurance about whether the financial  statements are free
of material misstatement. An audit includes examining, on a test basis, evidence
supporting  the amounts and  disclosures in the financial  statements.  An audit
also includes assessing the accounting principles used and significant estimates
made by  management,  as well as  evaluating  the  overall  financial  statement
presentation.  We believe  that our audits  provide a  reasonable  basis for our
opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the net assets available for benefits of the Plan as of
December  31,  1999 and 1998 and the  changes  in its net assets  available  for
benefits for the year ended  December  31, 1999 in  conformity  with  accounting
principles generally accepted in the United States.




/s/ Arthur Andersen


Atlanta, Georgia
June 8, 2000



Page 4

                           NATIONAL SERVICE INDUSTRIES

                           RETIREMENT AND 401(k) PLAN

                 STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS

                           DECEMBER 31, 1999 AND 1998









                                                    1999              1998

                                                 ----------       -----------
INVESTMENT in NSI DC TRUST,
     at fair value (Notes 2 and 3)               $2,264,925       $1,724,494

REFUNDS PAYABLE:
    Employer                                              0          (11,002)
    Participant                                           0          (11,665)
                                                 ----------       -----------
              Total refunds payable                       0          (22,667)

NET ASSETS AVAILABLE FOR BENEFITS                $2,264,925       $1,701,827
                                                 ==========       ===========








The accompanying notes are an integral part of these statements.



                                                                          Page 5

                           NATIONAL SERVICE INDUSTRIES

                           RETIREMENT AND 401(k) PLAN

            STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS

                      FOR THE YEAR ENDED DECEMBER 31, 1999








CONTRIBUTIONS:
   Employer, net of forfeitures                                   $  131,510
   Participant                                                       358,833
                                                                  -----------
            Total contributions                                      490,343

NET GAIN FROM INVESTMENT IN NSI DC TRUST (Note 3)                    126,768

BENEFITS PAID TO PARTICIPANTS                                        (54,013)
                                                                  -----------
NET INCREASE                                                         563,098

NET ASSETS AVAILABLE FOR BENEFITS, beginning of year               1,701,827
                                                                  -----------
NET ASSETS AVAILABLE FOR BENEFITS, end of year                    $2,264,925
                                                                  ===========







The accompanying notes are an integral part of this statement.



Page 6


                           NATIONAL SERVICE INDUSTRIES

                           RETIREMENT AND 401(k) PLAN

                          NOTES TO FINANCIAL STATEMENTS

                           DECEMBER 31, 1999 AND 1998



  1.     PLAN DESCRIPTION

The  following  is a  brief  description  of  the  National  Service  Industries
Retirement and 401(k) Plan (the "Plan") of National Service Industries,  Inc. of
Georgia and NSI Enterprises,  Inc.  (together,  the  "Employer").  Both National
Service Industries,  Inc. of Georgia and NSI Enterprises,  Inc. are wholly owned
subsidiaries of National Service Industries,  Inc. ("NSI").  This description is
provided for informational purposes only.  Participants should refer to the plan
agreement for more complete information.

General

The Plan is a defined  contribution  plan  established  under the  provisions of
Section 401(a) of the Internal  Revenue Code ("IRC").  The Plan covers nonunion,
full-time,  salaried employees of the Employer who have attained the age of 20.5
with at least six months of service and who are  classified  by the  Employer as
corporate office personnel or treasury function  personnel.  The Plan is subject
to the  provisions of the Employee  Retirement  Income  Security Act of 1974, as
amended.

Contributions

Participants  may  elect  to  contribute   between  1%  and  10%  of  before-tax
compensation,  as defined in the Plan, subject to certain  limitations under the
IRC.  Effective  January 1, 2000,  the Plan was amended to increase  the maximum
election  deferral  percentage  to 15%.  Effective  January  1,  1998,  matching
contributions  are  made  by  the  Employer  in an  amount  equal  to 50% of the
participant's  contribution up to 6% of compensation.  Additional  discretionary
amounts,  as determined by the board of directors of NSI, may be  contributed by
the Employer and are allocated to each  participant in the same  proportion that
each  participant's  annual  compensation  bears to annual  compensation  of all
participants  or at the  discretion  of the Employer on a per capita  basis.  No
discretionary contributions were made for the year ended December 31, 1999.

Vesting

Participants are always fully vested in their individual contributions.  Vesting
occurs at 20% for each year of service, as defined, with 100% vesting after five
years  of  service.  Nonvested  employer  contributions  are  forfeited  upon  a
participant's  withdrawal  from the Plan and are used to reduce future  employer
contributions.

Administration

All  administrative  expenses of the Plan were paid by the  Employer  during the
year ended December 31, 1999.


                                                                          Page 7

Participants' Accounts

Individual  accounts  are  maintained  for each of the  Plan's  participants  to
reflect  that  particular  participant's   contributions  and  related  employer
contributions  as well as the  participant's  share of the Plan's income and any
related investment management fees and expenses.

Investment in Master Trust

The Plan's  assets are  commingled  in the  National  Service  Industries,  Inc.
Defined  Contribution  Plans Master Trust (the "NSI DC Trust") together with the
assets  of  certain  defined  contribution  plans of other  NSI  divisions.  The
investments of the NSI DC Trust are subject to certain administrative guidelines
and  limitations  as to the type and amount of  securities  held.  Certain  fund
assets are allocated to selected independent investment managers to invest under
these general guidelines.

Effective  January 1, 1998,  INVESCO Trust Company was appointed  trustee of the
NSI DC Trust.

Investment Options

The separate  investment  options made available  under the Plan may be changed,
eliminated, or modified from time to time by the investment committee of the NSI
DC Trust.  Participants make their investment  elections in 5% increments,  with
changes allowed on a daily basis.  Participants may not direct the investment of
employer matching or discretionary contributions.  These are invested in the NSI
Stock Fund discussed below and are presented as  nonparticipant-directed in Note
5.

The separate investment options offered by the Plan are as follows:

          o    Diversified  Equity Fund.  This fund is invested in a mutual fund
               designed  to invest in a broad range of common  stocks  providing
               capital growth.

          o    Stable  Value  Fund.  This is a fixed  income  fund  designed  to
               provide  a steady  level of  current  income  while  focusing  on
               preservation of principal.  The majority of the fund's assets are
               guaranteed  investment contracts ("GICs") and synthetic GICs with
               insurance  companies  and banks.  This fund is managed by INVESCO
               Trust Company or its affiliates.

          o    Balanced  Fund.  This fund is invested in a commingled  fund that
               invests in a changing mix of high-quality  stocks and bonds.  The
               fund is designed  to provide  capital  growth and current  income
               while limiting the risk of principal  loss.  This fund is managed
               by INVESCO Trust Company or its affiliates.

          o    NSI  Stock  Fund.  This fund is  invested  in NSI  common  stock,
               although it may hold other  short-term  investments  from time to
               time.  A  participant  may not  direct  more than 50% of  his/her
               account balance to be invested in this fund.

          o    International  Fund. This fund is invested in a mutual fund which
               invests in the stock of  non-U.S.  companies  and is  designed to
               provide long-term growth.

          o    Index Fund.  This fund is invested in a mutual fund which invests
               in all of the stocks in the Standard & Poor's 500 Composite Stock
               Price Index.


Page 8

          o    Small Company Fund.  This fund is invested in a mutual fund which
               invests in small or emerging  companies  that show  potential for
               increased  size and  profitability.  The fund seeks  little or no
               current  income.  This  mutual  fund is managed by INVESCO  Trust
               Company or its affiliates.

          o    Bond Index  Fund.  This fund is invested  in a  collective  trust
               which   invests   in  a   well-diversified   portfolio   that  is
               representative of the domestic investment-grade bond market.

Loans to Participants

The  Plan  permits  loans  to  participants  up to  the  lesser  of  50%  of the
participant's  vested account  balance or $50,000.  A participant has up to five
years to repay the principal  and interest,  unless the loan is for the purchase
of a primary  residence,  in which case the repayment period will be established
at the time the loan is approved.  Loan processing fees are charged  directly to
the participant's account.  Interest rates on loans to participants are based on
market rates, as determined by the plan  administrator.  The interest rate as of
December 31, 1999 was 9%.

Interest  on loans is  included  in the net gain from  investment  in the NSI DC
Trust and is allocated to each investment fund based on participants' investment
elections.

Benefits

A participant or his/her  beneficiary is entitled to receive the distribution of
his/her vested account balance upon death,  disability,  retirement (age 65), or
other termination of employment. These benefits are payable in a lump-sum amount
or can be paid in installments at the  participant's  election if his/her vested
balance is greater than $5,000 and he/she is age 55 or older.

Benefits are payable in cash, except that any portion of a participant's account
balance which is invested in the NSI Stock Fund may be  distributed  in the form
of shares of NSI common  stock,  with  fractional  shares  paid in cash.  If the
equivalent number of shares to be distributed to a participant is less than 100,
then the  participant  may elect to  receive  cash  instead of shares as his/her
distribution.

Hardship   withdrawals  may  be  made  upon  proven  financial   hardship  of  a
participant,  as defined in the plan  agreement  and as  approved  by the Plan's
retirement committee.

Plan Termination

Although the Employer  intends for the Plan to be  permanent,  the Plan provides
that the Employer has the right to discontinue contributions or to terminate the
Plan at any time. In the event of plan  termination,  each participant  shall be
vested in the balance of his/her account and his/her  proportionate share of any
future adjustments.


  2.     SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Accounting

The  accounts  of the Plan are  maintained  by the  trustee on the cash basis of
accounting.  The accompanying  financial statements have been prepared using the
accrual  method  of  accounting  by  application  of  memorandum  entries.   The
preparation  of financial  statements  in  conformity  with  generally  accepted
accounting  principles  requires  the Plan's  management  to use  estimates  and
assumptions that affect the accompanying  financial  statements and disclosures.
Actual results could differ from these estimates.



                                                                          Page 9

Reclassifications

Statement of Position  ("SOP")  99-3,  "Accounting  for and Reporting of Certain
Defined  Contribution Plan Investments and Other Disclosure Matters," eliminates
the requirement for a defined contribution plan to disclose participant-directed
investment  programs.  SOP 99-3 was  adopted  for the 1999 plan  year,  and 1998
financial   statement   amounts  have  been   reclassified   to  eliminate   the
participant-directed   investment  program   disclosures.   In  addition,   unit
information  presented  in  the  prior  year's  financial  statements  has  been
eliminated in accordance with SOP 99-3.

Investment Valuation

Investments of the NSI DC Trust,  except for the GICs, are stated at fair value,
as determined by the trustee from quoted market prices.  Securities  traded on a
national  exchange  are  valued  at the last  reported  sales  price on the last
business day of the plan year; investments traded in the over-the-counter market
and listed securities for which no sale was reported on the last day of the plan
year are valued at the last reported bid price.

GICs included in the NSI DC Trust are fully benefit-responsive and are therefore
carried at contract  value (cost plus  accrued  interest) by the NSI DC Trust in
accordance  with SOP 94-4,  "Reporting of  Investment  Contracts for Welfare and
Pension Plans." At December 31, 1999 and 1998,  contract value approximates fair
value. At December 31, 1999, the weighted  average  crediting  interest rate was
6.18%.  For the year ended  December 31, 1999, the annual yield on the GICs held
by the NSI DC Trust was 6.4%.  For certain of the GICs held by the NSI DC Trust,
crediting  interest rates may be changed if certain events occur,  such as early
retirements,  plant  closings,  etc., but in no case are adjusted to a rate less
than 0%.

GICs are  subject  to credit  risk based on the  ability of the  issuers to meet
interest or principal payments, or both, as they become due.

Certain  GICs  included in the NSI DC Trust are  synthetic;  that is, the NSI DC
Trust owns certain fixed income  securities,  and the contract issuer provides a
"wrapper"  that  guarantees  a  fixed  rate  of  return  and  provides   benefit
responsiveness.  At December 31, 1999 and 1998, the fair value of the underlying
assets  of the  synthetic  GICs  (determined  from  quoted  market  prices)  was
$54,030,000 and $48,749,000,  respectively, and the value of the related wrapper
contracts was $990,000 and $(1,232,000), respectively.


  3.     NSI DC TRUST

Investment Income

Investment  income of the NSI DC Trust for the year ended  December  31, 1999 is
summarized as follows:

        Interest income                                             $ 4,392,012
        Dividends on NSI common stock                                   492,305
        Net depreciation in fair value of NSI common stock           (3,126,435)
        Net loss from common/collective trusts                         (389,640)
        Net income from mutual funds                                 21,103,949
                                                                    ------------
                      Total investment income                       $22,472,191
                                                                    ============


Page 10

Net Assets

The net assets of the NSI DC Trust are as follows at December 31, 1999 and 1998:

                                                    1999                 1998
                                              -------------        -------------
        Mutual funds                           $150,101,844         $119,999,722
        Common/collective trusts                 61,734,231           72,307,360
        Guaranteed investment contracts          62,398,546           59,224,919
        NSI common stock                         11,026,746           15,348,609
        Loans receivable from participants        7,942,464            7,590,683
        Cash equivalents                          4,873,957                    0
                                              -------------        -------------
                                                298,077,788          274,471,293
        Accrued investment income                    23,712                6,608
        Adjustments for pending trades              219,969               19,658
        Accrued expenses and other                  (28,248)                   0
                                              -------------        -------------
        Net assets                             $298,293,221         $274,497,559
                                              =============        =============

The allocation of the net assets of the NSI DC Trust to  participating  plans is
based on participant units and is as follows as of December 31, 1999 and 1998:



                                                          1999                       1998
                                                   Amount      Percent        Amount      Percent
                                              ---------------------------------------------------
                                                                            
National Service Industries Retirement and
    401(k) Plan                                $  2,264,925     0.76%     $  1,724,494     0.63%
All other plans                                 296,028,296    99.24       272,773,065    99.37
                                              ---------------------------------------------------
              Total                            $298,293,221   100.00%     $274,497,559   100.00%
                                              ===================================================



Investment in NSI Common Stock

As of December 31, 1999 and 1998, approximately 3.7% and 5.6%, respectively,  of
the NSI DC Trust's net assets were  invested in the common stock of NSI, a party
in interest to the Plan.


  4.     TAX STATUS

The Plan has received a determination  letter from the Internal  Revenue Service
dated  October 25, 1995 stating that the Plan was  designed in  accordance  with
plan  design  requirements  as of that  date.  The Plan has been  amended  since
receiving the determination  letter.  However,  the plan administrator  believes
that the Plan is currently designed and is being operated in compliance with the
applicable  requirements of the IRC. Therefore,  the plan administrator believes
that the Plan was  qualified  and that the related  trust was  tax-exempt  as of
December 31, 1999 and 1998.


                                                                         Page 11

  5.     NONPARTICIPANT-DIRECTED FUND INFORMATION

The  following   represents  the  net  assets  available  for  benefits  of  the
nonparticipant-directed portion of the plan as of December 31, 1999 and 1998:

                                                  1999                 1998
                                              -------------        -------------
        Investment in NSI DC Trust                 $306,761             $246,126
                                              =============        =============

The  nonparticipant-directed  portion of the  investment  in the NSI DC Trust is
invested in the NSI Stock Fund.

The change in the  nonparticipant-directed  net assets available for benefits is
as follows for the year ended December 31, 1999:

        Contributions--employer, net of forfeitures                    $120,508
        Net loss from investment                                        (59,631)
        Net loan activity and other                                       5,168
        Benefits paid to participants                                    (5,410)
                                                                   -------------
            Net increase                                               $ 60,635
                                                                   =============