As filed with the Securities and Exchange Commission on November 26, 1997
                                                  Registration No. 33-__________


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    Form S-8
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933


                             INTER-TEL, INCORPORATED
             (Exact name of registrant as specified in its charter)

                ARIZONA                                      86-0220994
           -----------------                            -------------------
     (State or other jurisdiction                          (IRS Employer
           of incorporation)                            Identification No.)

                        120 North 44th Street, Suite 200
                           Phoenix, Arizona 85304-1822
                    (Address of principal executive offices)

              Inter-Tel, Incorporated 1997 Long-Term Incentive Plan
            Inter-Tel, Incorporated 1997 Employee Stock Purchase Plan
                            (Full Title of the Plans)


                                STEVEN G. MIHAYLO
         Chairman of the Board of Directors and Chief Executive Officer
                             INTER-TEL, INCORPORATED
                        120 North 44th Street, Suite 200
                           Phoenix, Arizona 85304-1822
                     (Name and address of agent for service)

                                 (602) 302-8900
          (Telephone number, including area code, of agent for service)

                                   Copies to:
                           PATRICK J. SCHULTHEIS, ESQ.
                       WILSON, SONSINI, GOODRICH & ROSATI
                            Professional Corporation
                               650 Page Mill Road
                        Palo Alto, California 94304-1050



=======================================================================================================================
                  Title of                        Amount          Proposed              Proposed            Amount of
                Securities to                     to be       Maximum Offering      Maximum Aggregate     Registration
                be Registered                   Registered      Price Per Share       Offering Price              Fee
- -----------------------------------------------------------------------------------------------------------------------
                                                                                                     
Common Stock, no par value per share:
  Inter-Tel, Incorporated 1997 Long-Term       1,308,000             $7.40109(1)         $ 9,680,625(1)    $2,933.52(1)
   Incentive Plan
  Inter-Tel, Incorporated 1997 Long-Term       1,092,000            $21.12500(2)         $23,068,500(2)    $6,990.45(2)
   Incentive Plan
  Inter-Tel, Incorporated 1997 Employee          500,000            $17.95625(3)         $ 8,978,125(3)    $2,720.64(3)
   Stock Purchase Plan
     TOTALS                                    2,900,000                                                  $12,644.61

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

    (1)  Estimated  pursuant to Rule 457 of  Regulation C solely for the purpose
         of calculating  the  registration  fee. The proposed  maximum  offering
         price per share  with  respect to the  2,400,000  shares  reserved  for
         issuance upon exercises of outstanding  stock options granted under the
         Inter-Tel,   Incorporated  1997  Long-Term   Incentive  Plan  has  been
         estimated  pursuant to Rule 457(h) under which Rule the per share price
         of options to purchase stock under an employee stock option plan may be
         estimated  by  reference  to the  exercise  price of such  options. The
         weighted  average price of the 1,308,000  shares subject to outstanding
         options under the Inter-Tel, Incorporated 1997 Long-Term Incentive Plan
         is $7.40109.

    (2)  Estimated  pursuant to Rule 457 of  Regulation C solely for the purpose
         of calculating  the  registration  fee. The proposed  maximum  offering
         price per share  with  respect to the  1,092,000  shares  reserved  for
         issuance under the  Inter-Tel,  Incorporated  1997 Long-Term  Incentive
         Plan has been  estimated  to be the  average  of the high and low price
         reported in the Nasdaq National Market on November 25, 1997.

    (3)  Estimated  pursuant to Rule 457 of  Regulation C solely for the purpose
         of calculating  the  registration  fee. The proposed  maximum  offering
         price per  share  with  respect  to the  500,000  shares  reserved  for
         issuance under the Inter-Tel, Incorporated 1997 Employee Stock Purchase
         Plan has been  estimated  to be 85% of the  average of the high and low
         price reported in the Nasdaq National Market on November 25, 1997.

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT


    Item 3.  Information Incorporated by Reference.
             -------------------------------------

      There are hereby incorporated by reference in this Registration  Statement
    the following documents and information heretofore filed with the Securities
    and Exchange Commission:

      (a)  The  Registrant's  Registration  Statement  on  Form  S-3  (File  No.
    333-39221) (the "Registration Statement"),  filed pursuant to the Securities
    Act of 1933,  as amended  (the  "Securities  Act"),  including  the  Amended
    Prospectus  dated  November  20,  1997  included  therein,  relating  to the
    Registrant's public offering of its Common Stock.

      (b)  The description of the  Registrant's  Common  Stock  contained in the
    Registrant's  Registration  Statement  on Form 8-A dated  February 26, 1982,
    filed  pursuant to Section 12 of the  Securities  Exchange  Act of 1934,  as
    amended, including any amendment or report filed for the purpose of updating
    such description. All documents filed by the Registrant pursuant to Sections
    13(a),  13(c),  14 and  15(d) of the  Exchange  Act  after  the date of this
    registration statement and prior to the filing of a post-effective amendment
    which  indicates  that  all  securities  offered  have  been  sold or  which
    deregisters  all  securities  then remaining  
                                       2

unsold,  shall be deemed to be  incorporated  by reference in this  registration
statement and to be part hereof from the date of filing such documents.

    Item 4.  Description of Securities.
             -------------------------

      Not applicable.

    Item 5.  Interests of Named Experts and Counsel.
             --------------------------------------

      Not applicable.

    Item 6.  Indemnification of Directors and Officers.
             -----------------------------------------

     The Company's  Restated  Articles of  Incorporation  limit,  to the maximum
extent  permitted  by Arizona law,  the  personal  liability  of  directors  for
monetary  damages  for  breach  of their  fiduciary  duties as a  director.  The
Company's  Restated  Articles of  Incorporation  provide that the Company  shall
indemnify  its officers and  directors to the fullest  extent  permitted by law,
subject to certain  exceptions.  The Company has  entered  into  indemnification
agreements with its officers and directors  containing  provisions  which are in
some respects broader than the specific indemnification  provisions contained in
the Arizona Revised  Statutes.  The  indemnification  agreements may require the
Company,  among other things,  to indemnify such officers and directors  against
certain  liabilities  that may  arise by reason of their  status or  service  as
directors or officers (other than liabilities arising from willful misconduct of
a  culpable  nature),  to advance  their  expenses  incurred  as a result of any
proceeding  against  them as to which they could be  indemnified,  and to obtain
directors'  and  officers'  insurance,  if available on  reasonable  terms.  The
Company  believes  that these  agreements  are  necessary  to attract and retain
qualified persons as directors and officers.

     At present,  there is no pending  litigation  or  proceeding  involving any
director,  officer,  employee or agent of the Company where indemnification will
be required or permitted.  The Company is not aware of any threatened litigation
or proceeding which may result in a claim or such indemnification.

     The  Company  currently   maintains   directors'  and  officers'  liability
insurance.

     Reference  is  also  made  to  Section  11 of  the  Underwriting  Agreement
contained in Exhibit 1.1 to the amendment to the Company's S-3 filed on November
20, 1997,  indemnifying officers and directors of the Registrant against certain
liabilities.

    Item 7.  Exemption from Registration Claimed.
             -----------------------------------

      Not applicable.
                                       3

    Item 8.  Exhibits.
             --------

             Exhibit
             Number
             -------

                5.1           Opinion of John L. Gardner, General Counsel, as to
                              the legality of securities being registered.

               10.1           Inter-Tel,  Incorporated 1997 Long-Term  Incentive
                              Plan.

               10.2           Inter-Tel,   Incorporated   1997  Employee   Stock
                              Purchase Plan.

               23.1           Consent of Independent Auditors.

               23.2           Consent of Counsel (included in Exhibit 5.1).

               24.1           Power of Attorney.
    ------------------------------

    Item 9.  Undertakings.
             ------------

      (a) The undersigned Registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
    a  post-effective  amendment to this  registration  statement to include any
    material information with respect to the plan of distribution not previously
    disclosed  in the  registration  statement  or any  material  change to such
    information in the registration statement.

         (2) That,  for the  purpose  of  determining  any  liability  under the
    Securities Act, each such  post-effective  amendment shall be deemed to be a
    new registration  statement relating to the securities offered therein,  and
    the  offering  of such  securities  at that  time  shall be deemed to be the
    initial bona fide offering thereof.

         (3) To remove from registration by means of a post-effective  amendment
    any  of  the  securities   being  registered  which  remain  unsold  at  the
    termination of the offering.

      (b) The undersigned  Registrant  hereby  undertakes  that, for purposes of
    determining  any  liability  under the  Securities  Act,  each filing of the
    Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
    Exchange  Act (and,  where  applicable,  each filing of an employee  benefit
    plan's annual report  pursuant to Section 15(d) of the Exchange Act) that is
    incorporated by reference in the  registration  statement shall be deemed to
    be a new registration  statement relating to the securities offered therein,
    and the offering of such  securities  at that time shall be deemed to be the
    initial bona fide offering thereof.

      (c)  Insofar  as  indemnification   for  liabilities   arising  under  the
    Securities  Act  of  1933  may  be  permitted  to  directors,  officers  and
    controlling persons of the Registrant  pursuant to the Registrant's  Bylaws,
    indemnification  agreements,  or otherwise,  the Registrant has been advised
    that  in  the  opinion  of  the  Securities  and  Exchange  Commission  such
    indemnification
                                        4

    is  against  public  policy  as  expressed  in the Act  and  is,  therefore,
    unenforceable.  In the event that a claim for  indemnification  against such
    liabilities  (other than the payment by the Registrant of expenses  incurred
    or paid by a director,  officer or  controlling  person of the Registrant in
    the  successful  defense of any action,  suit or  proceeding) is asserted by
    such  director,  officer  or  controlling  person  in  connection  with  the
    securities being  registered,  the Registrant will, unless in the opinion of
    its counsel the matter has been settled by controlling precedent,  submit to
    a  court   of   appropriate   jurisdiction   the   question   whether   such
    indemnification  by it is against  public policy as expressed in the Act and
    will be governed by the final adjudication of such issue. 
                                       5

                                   SIGNATURES


      Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  the
    Registrant, Inter-Tel,  Incorporated, an Arizona corporation, certifies that
    it has reasonable  grounds to believe that it meets all of the  requirements
    for filing on Form S-8 and has duly caused this registration statement to be
    signed on its behalf by the undersigned,  thereunto duly authorized,  in the
    City of Phoenix, State of Arizona, on November 26, 1997 .

                                         INTER-TEL, INCORPORATED

                                         By: /s/ Kurt R. Kneip
                                             -----------------
                                         Kurt R. Kneip, Chief Financial Officer


                                POWER OF ATTORNEY
                                -----------------

      KNOW ALL  PERSONS BY THESE  PRESENTS,  that each  person  whose  signature
    appears below  constitutes and appoints Steven G. Mihaylo and Kurt R. Kneip,
    jointly  and  severally,  his  attorneys-in-fact,  each  with  the  power of
    substitution,  for him in any and all capacities,  to sign any amendments to
    this Registration Statement on Form S-8, and to file the same, with exhibits
    thereto and other documents in connection therewith, with the Securities and
    Exchange  Commission,  hereby ratifying and confirming all that each of said
    attorneys-in-fact,  or his substitute or substitutes,  may do or cause to be
    done by virtue hereof.

      Pursuant  to  the  requirements  of  the  Securities  Act  of  1933,  this
    registration  statement  has been  signed by the  following  persons  in the
    capacities and on the date indicated.



        SIGNATURE                              TITLE                                  DATE

                                                                           
/s/Steven G. Mihaylo           Chairman of the Board and Chief Executive        October 25, 1997
- --------------------           Officer (Principal Executive Officer)
  (Steven G. Mihaylo)          

/s/Kurt R. Kneip               Chief Financial Officer (Principal               October 25, 1997
- ----------------               Financial and Accounting Officer)
  (Kurt R. Kneip)              

/s/Gary D. Edens               Director                                         October 25, 1997
- ----------------
  (Gary D. Edens)

/s/Maurice H. Esperseth        Director                                         October 25, 1997
- -----------------------
  (Maurice H. Esperseth)       

/s/C. Roland Haden             Director                                         October 25, 1997
- ------------------
  (C. Roland Haden)

/s/Norman Stout                Director                                         October 25, 1997
- ---------------
  (Norman Stout)

/s/J. Robert Anderson          Director                                         October 25, 1997
- ---------------------
  (J. Robert Anderson)

                                       6

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549




                                    EXHIBITS



                       Registration Statement on Form S-8

                             Inter-Tel, Incorporated

                                November 26, 1997
                                INDEX TO EXHIBITS


Exhibit                                                                 
Numbered
Number                               Description                          Page
- ------     ----------------------------------------------------------     ----

   5.1     Opinion of John L. Gardner, General Counsel                      8

  10.1     Inter-Tel, Incorporated 1997 Long-Term Incentive Plan.           9

  10.2     Inter-Tel, Incorporated 1997 Employee Stock Purchase Plan.      24

  23.1     Consent of Ernst & Young LLP, Independent Auditors.             37

  23.2     Consent of John L. Gardner, General Counsel
           (Contained in Exhibit 5.1).                                      8

  24.1     Power of Attorney.                                               6

- ------------------------------
                                       7