Page 13
                                                                Exhibit 10(iii)A

                             STOCK OPTION AGREEMENT
                            FOR NONEMPLOYEE DIRECTORS



          THIS  AGREEMENT,  made as of the 19th day of March,  1997 (the  "Grant
     Date"),  between National Service Industries,  Inc., a Delaware corporation
     (the "Company"), and Optionee (the "Optionee").

          WHEREAS,  in order to  provide  additional  incentive  to  nonemployee
     directors  joining the Board of Directors to exert maximum  efforts for the
     success of the Company,  the Executive Resource and Compensation  Committee
     of the Board of  Directors  of the  Company has on this date  approved  the
     option grant provided herein, as further ratified by the Board of Directors
     on this date; and

     NOW, THEREFORE, the parties hereto agree as follows:

     1. Grant of Option.

          1.1 Subject to, and in accordance  with,  the terms and conditions set
     forth in this  Agreement,  the Company  hereby  grants to the  Optionee the
     right and option (the "Option") to purchase all or any part of an aggregate
     of 1,000 whole shares of common  stock,  par value $1.00 per share,  of the
     Company (the "Shares").

          1.2 The Option is not intended to qualify as an Incentive Stock Option
     within the meaning of Section 422A of the Code.

          1.3 Except as otherwise  expressly set forth herein,  the  capitalized
     terms used in this  Agreement  shall have the same  definitions  as are set
     forth in the National Service Industries,  Inc. 1992 Nonemployee Directors'
     Stock Option Plan.  Notwithstanding the foregoing reference,  the Option is
     not granted under that Plan.

     2. Purchase Price.

          The price at which the Optionee  shall be entitled to purchase  Shares
     upon the exercise of the Option shall be $38.75 per Share.

     3. Duration of Option.

          The  Option  shall be  exercisable  to the  extent  and in the  manner
     provided  herein  for a period of ten (10)  years  from the Grant Date (the
     "Exercise  Term");  provided,  however,  that  the  Option  may be  earlier
     terminated as provided in Section 6 hereof.

Page 14
Exhibit 10(iii)A

     4. Exercisability of Option.

          Unless otherwise provided in this Agreement,  the Option shall entitle
the Optionee to purchase, in whole at any time or in part from time to time, the
shares covered by the option after the expiration of one (1) year from the Grant
Date.

     5. Manner of Exercise and Payment.

          5.1 Subject to the terms and conditions of this Agreement,  the Option
may be exercised by delivery of written notice to the Company,  at its principal
executive  office.  Such  notice  shall  state that the  Optionee is electing to
exercise  the  Option and the number of Shares in respect of which the Option is
being  exercised  and shall be signed by the  person or persons  exercising  the
Option. If requested, such person or persons shall (i) deliver this Agreement to
the  Secretary  of the  Company  who shall  endorse  thereon a notation  of such
exercise and (ii) provide  satisfactory  proof as to the right of such person or
persons to exercise the Option.

          5.2  The  notice  of  exercise  described  in  Section  5.1  shall  be
accompanied  by the full  purchase  price for the Shares in respect of which the
Option is being  exercised,  in cash, by check or by transferring  Shares to the
Company  having a Fair Market  Value on the day  preceding  the date of exercise
equal to the cash amount for which such Shares are substituted.

          5.3 Upon receipt of notice of exercise and full payment for the Shares
in respect of which the Option is being exercised, the Company shall, subject to
Section 16 below, take such action as may be necessary to effect the transfer to
the Optionee of the number of Shares as to which such exercise was effective.

          5.4 The  Optionee  shall not be deemed to be the holder of, or to have
any of the rights of a holder with respect to, any Shares  subject to the Option
until (i) the Option  shall have been  exercised  pursuant  to the terms of this
Agreement  and the  Optionee  shall  have paid the full  purchase  price for the
number of Shares in respect of which the Option was exercised,  (ii) the Company
shall  have  issued and  delivered  the  Shares to the  Optionee,  and (iii) the
Optionee's  name shall have been entered as a stockholder of record on the books
of the  Company,  whereupon  the  Optionee  shall  have  full  voting  and other
ownership rights with respect to such Shares.

     6. Termination of Service.

          6.1  Termination  for Cause.  If the Optionee's  service as a Director
terminates  for Cause,  the Option  shall  immediately  terminate in full and no
rights hereunder may be exercised.

          6.2 Other  Termination  of  Service.  If the  Optionee's  service as a
Director is  terminated  for any reason  other than for Cause,  the Option shall
continue to be exercisable in whole or in part (to the extent exercisable on the
date of such  termination)  at any time within three (3) years after the date of
such termination,  but in no event after the expiration of the Exercise Term. In
the event of the Optionee's death, the Option shall be exercisable, to the

                                       2

                                                                         Page 15
                                                                Exhibit 10(iii)A

extent provided in this Agreement, by the legatee or legatees under his will, or
by his personal representatives or distributees and such person or persons shall
be substituted for the Optionee each time the Optionee is referred to herein.

     7. Effect of Change in Control.

          Notwithstanding  anything contained in this Agreement to the contrary,
in the event of a Change in Control, (i) the Option shall become immediately and
fully  exercisable,  and (ii) the Optionee  will be  permitted to surrender  for
cancellation within sixty (60) days after such Change in Control,  the Option or
any portion of the Option to the extent not yet exercised and the Optionee shall
be  entitled to receive  immediately  a cash  payment in an amount  equal to the
excess,  if any, of (A) the greater of (x) the Fair  Market  value,  on the date
preceding  the date of the  surrender,  of the  Shares  subject to the Option or
portion of the Option  surrendered  or (y) the Adjusted Fair Market Value of the
Shares subject to the Option or the portion of the Option surrendered,  over (B)
the  aggregate  purchase  price  for such  Shares  under the  Option;  provided,
however,  that if the Option  was  granted  within  six (6) months  prior to the
Change in Control,  the Optionee shall be entitled to surrender for cancellation
the  Option or any  portion  of the  Option  during  the sixty  (60) day  period
following  the  expiration  of six (6) months from the Grant Date and to receive
the amount described above with respect to such surrender for cancellation.

     8. Nontransferability.

          The  Optionee  may  designate a person or persons to  receive,  in the
event of the  Optionee's  death,  the  Option  or any  amount  payable  pursuant
thereto, to which the Optionee would then be entitled.  Such designation will be
made upon forms  supplied by and  delivered to the Company and may be revoked in
writing.  If an Optionee fails effectively to designate a beneficiary,  then his
or her estate  will be deemed to be the  beneficiary.  The  Option  shall not be
transferable  other  than by will or by the laws of  descent  and  distribution.
During the lifetime of the Optionee, the Option shall be exercisable only by the
Optionee.

     9. No Right to Continuing Service.

          Nothing in this Agreement  shall be interpreted or construed to confer
upon the Optionee any right with respect to continuance of service as a director
of the Company,  nor shall this Agreement interfere in any way with the right of
the Company to terminate the Optionee's service as a director at any time.

    10. Adjustments.

          10.1 In the event of a Change in Capitalization,  the Board shall make
appropriate  adjustments  to the  number  and class of Shares or other  stock or
securities subject to the Option and the purchase price for such Shares or other
stock or  securities.  The  Board's  adjustment  shall be  effective  and final,
binding, and conclusive for all purposes of this Agreement.

                                       3

Page 16
Exhbit 10(iii)A



          10.2 Any stock  adjustment  in the Shares or other stock or securities
subject to the Option (including any adjustments in the purchase price) shall be
made only to the extent necessary to maintain the proportionate  interest of the
Optionee and preserve, without exceeding, the value of such Option.

          10.3 If, by reason of a Change in Capitalization, an Optionee shall be
entitled to exercise  the Option with  respect to new,  additional  or different
shares of stock or securities,  such new,  additional or different  shares shall
thereupon  be subject to all of the  conditions  which  were  applicable  to the
Shares  subject  to the  Option,  as the case may be,  prior to such  Change  in
Capitalization.


     11. Terminating Events.

          Subject  to  Section  7  hereof,  upon the  effective  date of (i) the
liquidation or dissolution of the Company or (ii) a merger or  consolidation  of
the Company (a "Transaction"), the Option shall continue in effect in accordance
with its terms and the  Optionee  shall be entitled to receive in respect of all
Shares subject to the Option,  upon exercise of the Option,  the same number and
kind of stock,  securities,  cash,  property,  or other  consideration that each
holder of Shares was entitled to receive in the Transaction.

     12. Modification of Agreement.

          This Agreement may be modified,  amended, suspended or terminated, and
any terms or conditions may be waived, but only by a written instrument executed
by the parties hereto.

     13. Severability.

          Should any provision of this Agreement be held by a court of competent
jurisdiction  to be  unenforceable  or invalid  for any  reason,  the  remaining
provisions  of this  Agreement  shall not be affected by such  holding and shall
continue in full force in accordance with their terms.

     14. Governing Law.

          The validity,  interpretation,  construction  and  performance of this
Agreement shall be governed by the laws of the State of Delaware  without giving
effect to the conflicts of laws  principles  thereof,  except to the extent that
such law is pre-empted by federal law.

     15. Successors in Interest.

          This Agreement  shall inure to the benefit of and be binding upon each
successor  to the  Company.  This  Agreement  shall  inure to the benefit of the
Optionee's legal representatives.  All obligations imposed upon the Optionee and
all rights granted to the Company under this Agreement  shall be final,  binding
and  conclusive  upon  the  Optionee's  heirs,  executors,   administrators  and
successors.

                                       4

                                                                         Page 17
                                                                Exhibit 10(iii)A

     16. Regulations and Other Approvals; Governing Law.

          16.1 The  obligation  of the  Company to sell or deliver  Shares  with
respect  to the Option  granted  under  this  Agreement  shall be subject to all
applicable  laws, rules and  regulations,  including all applicable  federal and
state  securities  laws, and the obtaining of all such approvals by governmental
agencies as may be deemed necessary or appropriate by the Board.

          16.2 The grant is intended to comply with Rule 16b-3 promulgated under
the Exchange Act and the Board shall  interpret and administer the provisions of
the Agreement in a manner consistent therewith.

          16.3 The Option is subject to the requirement that, if at any time the
Board  determines,  in  its  discretion,  that  the  listing,  registration,  or
qualification  of Shares  issuable  pursuant  to the Option is  required  by any
securities  exchange  or under any  state or  federal  law,  or the  consent  or
approval of any  governmental  regulatory  body is  necessary  or desirable as a
condition of, or in connection  with, the grant of the Option or the issuance of
Shares,  no payment shall be made or Shares issued,  in whole or in part, unless
listing, registration,  qualification, consent, or approval has been effected or
obtained free of any conditions as acceptable to the Board.

          16.4 In the event that the  disposition  of Shares  acquired  pursuant
hereto  is not  covered  by a  then-current  registration  statement  under  the
Securities  Act of 1933,  as  amended,  and is not  otherwise  exempt  from such
registration,  such Shares shall be  restricted  against  transfer to the extent
required  by the  Securities  Act of  1933,  as  amended,  and Rule 144 of other
regulations  thereunder.  The Board may require any individual  receiving Shares
pursuant to the Option, as a condition  precedent to receipt of such Shares upon
exercise of the Option,  to represent and warrant to the Company in writing that
the  Shares  acquired  by such  individual  are  acquired  without a view to any
distribution  thereof and will not be sold or transferred other than pursuant to
an  effective  registration  thereof  under said Act or pursuant to an exemption
applicable  under  the  Securities  Act of 1933,  as  amended,  or the rules and
regulations  promulgated  thereunder.  The  certificates  evidencing any of such
Shares shall be appropriately inscribed with a legend reflecting their status as
restricted securities as aforesaid.

                                       5

Page 18
Exhibit 10(iii)A

     17. Resolution of Disputes.

          Any dispute or disagreement  which may arise under, or as a result of,
or in any way relate to, the interpretation, construction or application of this
Agreement  shall be determined by the Board.  Any  determination  made hereunder
shall be final,  binding, and conclusive on the Optionee and the Company for all
purposes.


ATTEST:                                 NATIONAL SERVICE  INDUSTRIES INC.


                                     By:                               
        Secretary                        James S. Balloun
                                         Chairman of the Board, President, and
                                         Chief Executive Officer


                                
                                         Name of Optionee:  Optionee




                                       6