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:

        Selig Chemical Industries Retirement 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.

                              Selig Chemical Industries Retirement 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
                   Selig Chemical Industries Retirement Plan


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



REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS



To the Plan Administrator of
Selig Chemical Industries Retirement Plan:


We have audited the accompanying statements of net assets available for benefits
of Selig Chemical  Industries  Retirement  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


                    SELIG CHEMICAL INDUSTRIES RETIREMENT 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)               $14,751,974        $13,775,052

CONTRIBUTIONS RECEIVABLE:
    Employer                                         181,433            167,808
    Participant                                            0             38,256
                                                 -----------        ------------
       Total contributions receivable                181,433            206,064

REFUNDS PAYABLE TO PARTICIPANTS                            0            (25,578)
                                                 -----------        ------------
NET ASSETS AVAILABLE FOR BENEFITS                $14,933,407        $13,955,538
                                                 ===========        ============










The accompanying notes are an integral part of these statements.



                                                                          Page 5


                    SELIG CHEMICAL INDUSTRIES RETIREMENT PLAN

            STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS

                      FOR THE YEAR ENDED DECEMBER 31, 1999










CONTRIBUTIONS:
    Employer, net of forfeitures                                    $   174,124
    Participant                                                         587,634
                                                                    ------------
              Total contributions                                       761,758

NET GAIN FROM INVESTMENT IN NSI DC TRUST (Note 3)                     1,330,107

BENEFITS PAID TO PARTICIPANTS                                        (1,113,996)
                                                                    ------------
NET INCREASE                                                            977,869

NET ASSETS AVAILABLE FOR BENEFITS, beginning of year                 13,955,538
                                                                    ------------
NET ASSETS AVAILABLE FOR BENEFITS, end of year                      $14,933,407
                                                                    ============









The accompanying notes are an integral part of this statement.



Page 6



                    SELIG CHEMICAL INDUSTRIES RETIREMENT PLAN

                          NOTES TO FINANCIAL STATEMENTS

                           DECEMBER 31, 1999 AND 1998



  1.     PLAN DESCRIPTION

The following is a brief description of the Selig Chemical Industries Retirement
Plan (the "Plan") of the Selig Chemical  Industries  Division (the "Company") of
National  Service  Industries,  Inc. of Georgia,  a wholly owned  subsidiary  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,  as amended and  restated  effective  September 1, 1989 and as further
amended  through  January 1, 1994, is a defined  contribution  plan  established
under the provisions of Section 401(a) of the Internal Revenue Code ("IRC"). The
Plan covers all salaried and nonunion  hourly  employees of the Company who have
attained the age of 21 and have  completed one year of service  consisting of at
least 1,000 hours of employment. Effective January 1, 2000, the Plan was amended
to reduce the service  requirement  for  eligibility to six months.  The Plan is
subject to the  provisions  of the Employee  Retirement  Income  Security Act of
1974, as amended.

Contributions

Contributions are made by the Company and participants of the Plan. Participants
may  elect to  contribute  between  2% and 15% of  before-tax  compensation,  as
defined in the Plan, subject to certain limitations under the IRC.

The Company contributes an amount equal to 5% of net profits, as defined,  which
may be  increased by a  resolution  of the board of  directors  of NSI.  Company
contributions  are allocated to participants who made elective  deferrals to the
Plan during the plan year,  are  employed on the last day of the plan year,  and
have completed one year of service, as defined.  Allocations are made based on a
participant's  compensation (maximum of $40,000 per participant) relative to the
compensation of all qualifying participants.

Vesting

Participants are always fully vested in their individual contributions.  Vesting
of  employer  contributions  occurs on an  increasing  scale,  ranging  from 20%
vesting  after three years of service,  as defined,  to 100% vesting after seven
years of service.  Effective  January 1, 2000, the Plan's vesting  provision was
amended to be a five-year  graded scale.  Forfeitures of employer  contributions
are  allocated  among the remaining  participants  in the same manner as company
contributions.


                                                                          Page 7

Administration

The  responsibility  for  administration  of the  Plan  rests  with  the  Plan's
retirement  committee,  which is appointed by the board of directors of NSI. All
administrative  expenses  of the Plan were paid by the  Company  during the year
ended December 31, 1999.

Participants' Accounts

Individual  accounts  are  maintained  for each of the  Plan's  participants  to
reflect  the  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.

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

          o    Diversified  Equity Fund.  This fund is invested in a mutual fund
               that is  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 this fund's assets are
               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  primarily  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 that
               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 that  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 that
               invests in small or emerging  companies  that show  potential for
               increased  size and  profitability.  The fund seeks  little or no
               current income.  This fund is managed by INVESCO Trust Company or
               its affiliates.

          o    Bond Index Fund. This fund is invested in a collective trust that
               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 NSI DC Trust
and is  allocated  to each  investment  fund based on  participants'  investment
elections.

Benefits

A participant is entitled to receive the  distribution of his/her vested account
balance upon death,  disability,  or retirement (age 65 or age 55 with ten years
of credited service).  These benefits are payable in a lump-sum amount or can be
paid in installments at the participant's election. A participant who terminates
employment  with the Company for reasons other than these is entitled to receive
his/her  contributions in a lump sum as soon as administratively  feasible.  The
vested  portion  of  the  participant's   employer  contributions  is  generally
distributable on the first day of the first month following the later of his/her
termination  date or sixty-fifth  birthday.  If this vested portion is less than
$5,000,  then the  participant  may elect to have his/her  interest  distributed
immediately  in a lump sum.  Effective  May 25,  1999,  the Plan was  amended to
permit  distribution  of the employer  contribution  portion of a  participant's
account as soon as administratively feasible.

Benefits are payable in cash, except that any portion of a participant's account
balance  which is invested in the NSI Stock Fund is  distributed  in the form of
shares of NSI common stock, with fractional shares paid in cash.

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 Company  intends for the Plan to be  permanent,  the Plan  provides
that the Company 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 or forfeitures.


                                                                          Page 9

  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.

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 guaranteed  investment contracts
("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 they 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 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.


Page 10

  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
                                                                  ==============

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
                                           -----------------------------------------------------
                                                                             
Selig Chemical Industries Retirement Plan   $ 14,751,974    4.95%        $ 13,775,052    5.02%
All other plans                              283,541,247   95.05          260,722,507   94.98
                                           -----------------------------------------------------
              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.


                                                                         Page 11

  4.     TAX STATUS

The Plan has received a favorable determination letter from the Internal Revenue
Service dated February 14, 1996 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.