<PAGE>   1
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 22, 1999

                                                         REGISTRATION NO. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                             SALESLOGIX CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

              DELAWARE                            86-0808340
   (STATE OR OTHER JURISDICTION OF      (I.R.S. EMPLOYER IDENTIFICATION
    INCORPORATION OR ORGANIZATION)                    NO.)

                         8800 N. GAINEY DRIVE, SUITE 200
                            SCOTTSDALE, ARIZONA 85258
          (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES, INCLUDING ZIP CODE)

                SALESLOGIX CORPORATION 1999 EQUITY INCENTIVE PLAN
         SALESLOGIX CORPORATION NON-EMPLOYEE DIRECTOR STOCK OPTION PLAN
            SALESLOGIX CORPORATION 1999 EMPLOYEE STOCK PURCHASE PLAN
                          (FULL TITLE OF THE PLANS)


           PATRICK M. SULLIVAN                            COPY TO:
  PRESIDENT, CHIEF EXECUTIVE OFFICER AND              THOMAS H. CURZON
          CHAIRMAN OF THE BOARD                     OSBORN MALEDON, P.A.
          SALESLOGIX CORPORATION                 2929 NORTH CENTRAL AVENUE
     8800 N. GAINEY DRIVE, SUITE 200            PHOENIX, ARIZONA 85012-2794
        SCOTTSDALE, ARIZONA 85258                      (602) 640-9000
              (602) 368-3700
            FAX (602) 368-3799

(NAME, ADDRESS, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF AGENT FOR SERVICE)


                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------------------------------------------
                                                                         PROPOSED        PROPOSED MAXIMUM
                                                     NUMBER TO BE         MAXIMUM       AGGREGATE OFFERING       AMOUNT OF
      TITLE OF SECURITIES TO BE REGISTERED           REGISTERED(1)    OFFERING PRICE          PRICE           REGISTRATION FEE
--------------------------------------------------------------------------------------------------------------------------------
<S>                                                  <C>              <C>               <C>                   <C>
Common Stock, $.001 par value, subject to
outstanding options with fixed exercise prices
under the SalesLogix Corporation 1996 Equity
Incentive Plan                                           301,912         $  0.15(2)        $    45,286.80           $   12.59
--------------------------------------------------------------------------------------------------------------------------------
                                                          16,480            0.20(2)              3,296.00                 .92
--------------------------------------------------------------------------------------------------------------------------------
                                                         139,611            0.24(2)             33,506.64                9.31
--------------------------------------------------------------------------------------------------------------------------------
                                                          86,321            0.48(2)             41,434.08               11.52
--------------------------------------------------------------------------------------------------------------------------------
                                                          71,882            0.60(2)             43,129.20               11.99
--------------------------------------------------------------------------------------------------------------------------------
                                                         685,170            1.53(2)          1,048,310.10              291.43
--------------------------------------------------------------------------------------------------------------------------------
                                                         594,808            9.00(2)          5,353,272.00            1,488.21
--------------------------------------------------------------------------------------------------------------------------------
                                                          37,282           13.08(2)            487,648.56              135.57
--------------------------------------------------------------------------------------------------------------------------------
Common Stock, $.01 par value, not subject to
outstanding options or not having fixed exercise
prices under the:
--------------------------------------------------------------------------------------------------------------------------------
      SalesLogix Corporation 1996 Equity
      Incentive Plan                                   1,228,905          $11.8125(3)      $14,516,440.00            4,035.57
--------------------------------------------------------------------------------------------------------------------------------
      SalesLogix Corporation 1999 Employee Stock
      Purchase Plan                                      300,000          $11.8125(3)      $ 3,543,750.00              985.16
--------------------------------------------------------------------------------------------------------------------------------
      SalesLogix Corporation 1999 Non-Employee
      Director Stock Option Plan                         200,000          $11.8125(3)      $ 2,362,500.00              656.78
--------------------------------------------------------------------------------------------------------------------------------
                     TOTAL:                            3,699,653                           $27,918,965.00           $7,639.05
================================================================================================================================
</TABLE>

(1)  Based on shares subject to outstanding options or reserved for future
     issuance pursuant to employee benefit plans as of June 16, 1999. Together
     with an indeterminate number of additional shares which may be necessary to
     adjust the number of shares reserved for issuance pursuant to such employee
     benefit plans as the result of any future stock split, stock dividend or
     similar adjustment of the registrant's outstanding Common Stock.

(2)  Computed pursuant to Rule 457(h) under the Securities Act of 1933, as
     amended, based upon the exercise prices of options granted as of the filing
     date of this Registration Statement.

(3)  Estimated as of June 16, 1999, solely for the purpose of calculating the
     registration fee pursuant to Rule 457(c) under the Securities Act of 1933,
     as amended, based upon the average of the high and low prices of the
     registrant's common stock for June 16, 1999, as listed on the Nasdaq Stock
     Market.
<PAGE>   2
                                     PART II

                 INFORMATION REQUIRED IN REGISTRATION STATEMENT

ITEM 3:  INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         The following documents filed with the Securities and Exchange
Commission (the "Commission") are hereby incorporated by reference in this
Registration Statement:

         (a) The registrant's prospectus (the "Prospectus") filed with the
Securities and Exchange Commission (the "Commission") on May 27, 1999 pursuant
to Rule 424(b) of the Securities Act of 1933, as amended (the "Securities Act");

         (b) The description of the registrant's Common Stock contained in the
Registration Statement on Form 8-A filed on May 21, 1999, under Section 12(g) of
the Exchange Act, including any amendments or reports 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 hereof and prior to the
filing of a post-effective amendment, which indicates that the securities
offered hereby have been sold or which deregisters the securities covered hereby
then remaining unsold, shall also be deemed to be incorporated by reference into
this Registration Statement and to be a part hereof commencing on the respective
dates on which such documents are filed.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

         The registrant's fifth restated certificate of incorporation ("Restated
Certificate") provides that the registrant shall indemnify directors, officers
and their legal representatives to the fullest extent permitted by the Delaware
general corporate law ("DGCL"). The DGCL contains an extensive indemnification
provision which provides that a corporation shall have the power to indemnify
any person who was or is a party or is threatened to be made a party to any
threatened, pending or completed action, suit or proceeding, whether civil,
criminal, administrative or investigative by reason of the fact that he is or
was a director, officer, employee or agent of the corporation, or is or was
serving at the request of the corporation as a director, officer, employee or
agent of another corporation, partnership, joint venture, trust or other
enterprise, against expenses (including attorneys' fees), judgments, fines and
amounts paid in settlement actually and reasonably incurred by him in connection
with such action, suit or proceeding if he acted in good faith and in a manner
he reasonably believed to be in or not opposed to the best interests of the
corporation and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful. In suits by or in the
right of a corporation, only expenses and not judgments, fines and amounts paid
in settlement may be indemnified against. In addition, if a director or
successfully defends against such action, suit or proceeding, such officer or
director must be indemnified against expenses.

         The Restated Certificate also provides that directors of the registrant
shall not be personally liable to the registrant or its stockholders for
monetary damages for breach of fiduciary duty. However, this provision does not
eliminate or limit the liability of a director for breach of the director's duty
of loyalty to the registrant or its stockholders, for acts or omissions not in
good faith or which involve intentional misconduct or a knowing violation of
law, for the payment of dividends or distributions or the redemption or purchase
of the registrant's shares of stock in violation of the DGCL, or for any
transaction from which the director derives an improper personal benefit. This
provision does not affect any liability of a director or officer under the
federal securities laws.

         The Restated Certificate requires and the DGCL authorizes, the
registrant to indemnify directors and officers on terms sufficiently broad to
permit indemnification under certain circumstances for liabilities arising under
the Securities Act. The directors and officers of the registrant also may be
indemnified against liability they may incur for serving in that capacity
pursuant to a liability insurance policy maintained by the registrant for such
purpose.


                                      II-1
<PAGE>   3
ITEM 8.  EXHIBITS

<TABLE>
<CAPTION>
   Exhibit Number     Description
   --------------     -----------
<S>                   <C>
          5.1         Opinion of Osborn Maledon, P.A. regarding legality of the
                      Common Stock being registered

         23.1         Consent of Ernst & Young LLP, Independent Auditors

         23.2         Consent of Ernst & Young LLP, Independent Auditors

         23.3         Consent of Ernst & Young LLP, Independent Auditors

         23.4         Consent of Osborn Maledon, P.A. (included in opinion
                      filed as Exhibit 5.1)

         24.1         Power of Attorney (see signature page)

         99.1         SalesLogix Corporation 1996 Equity Incentive Plan
                      (incorporated by reference to Exhibit 10.4 to the
                      Registration Statement on Form S-1)

         99.2         SalesLogix Corporation 1999 Non-Employee Director Stock
                      Option Plan (incorporated by reference to Exhibit 10.6 to
                      the Registration Statement on Form S-1)

         99.3         SalesLogix Corporation 1999 Employee Stock Purchase Plan
                      (incorporated by reference to Exhibit 10.7 to the
                      Registration Statement on Form S-1)
</TABLE>

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:

                           (i) To include any prospectus required by Section
10(a)(3) of the Securities Act;

                           (ii) To reflect in the prospectus any facts or events
arising after the effective date of this Registration Statement (or the most
recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in this
Registration Statement; and

                           (iii) To include any material information with
respect to the plan of distribution not previously disclosed in this
Registration Statement or any material change to such information in this
Registration Statement;

provided, however, that paragraphs (1)(i) and (1)(ii) above do not apply if the
information required to be included in a post effective amendment by those
paragraphs is contained in periodic reports filed by the registrant pursuant to
Section 13 or Section 15(d) of the Exchange Act that are incorporated by
reference in this 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 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 this 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 may be permitted to directors, officers and controlling persons
of the registrant pursuant to the foregoing provisions, or otherwise, the


                                      II-2
<PAGE>   4
registrant has been advised that in the opinion of the Commission such
indemnification is against public policy as expressed in the Securities 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 Securities Act and will be governed by the final
adjudication of such issue.


                                      II-3
<PAGE>   5
                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
registrant 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 Scottsdale, State of Arizona, on the 22nd day of
June, 1999.

                                      SALESLOGIX CORPORATION



                                      By:  /s/ Patrick M. Sullivan
                                           ------------------------------------
                                           Patrick M. Sullivan
                                           President and Chief Executive Officer

         Each person whose individual signature appears below hereby authorizes
Patrick M. Sullivan and Gary R. Acord, or either of them, as attorneys-in-fact
with full power of substitution, to execute in the name and on behalf of each
person, individually and in each capacity stated below, and to file, any and all
amendments to this Registration Statement, including any and all post-effective
amendments.

         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated below on the 22nd day of June, 1999.

<TABLE>
<CAPTION>
               SIGNATURE                                               Title
               ---------                                               -----
<S>                                             <C>
/s/ Patrick M. Sullivan                         President, Chief Executive Officer and Chairman of the
-----------------------------------------       Board (Principal Executive Officer)
Patrick M. Sullivan


/s/ Gary R. Acord                               Vice President, Chief Financial Officer, Secretary and
-----------------------------------------       Treasurer (Principal Financial and Accounting Officer)
Gary R. Acord


/s/ Harry D. Lambert                            Director
-----------------------------------------
Harry D. Lambert


/s/ Deepak Kamra                                Director
-----------------------------------------
Deepak Kamra


/s/ Anthony P. Morris                           Director
-----------------------------------------
Anthony P. Morris


/s/ David C. Schwab                             Director
-----------------------------------------
David C. Schwab


/s/ Craig A. Conway                             Director
-----------------------------------------
Craig A. Conway


/s/ John B. Carrington                          Director
-----------------------------------------
John B. Carrington
</TABLE>


                                      II-4
<PAGE>   6
                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
   Exhibit Number     Description
   --------------     -----------
<S>                   <C>
          5.1         Opinion of Osborn Maledon, P.A. regarding legality of the
                      Common Stock being registered

         23.1         Consent of Ernst & Young LLP, Independent Auditors

         23.2         Consent of Ernst & Young LLP, Independent Auditors

         23.3         Consent of Ernst & Young LLP, Independent Auditors

         23.4         Consent of Osborn Maledon, P.A. (included in opinion
                      filed as Exhibit 5.1)

         24.1         Power of Attorney (see signature page)

         99.1         SalesLogix Corporation 1996 Equity Incentive Plan
                      (incorporated by reference to Exhibit 10.4 to the
                      Registration Statement on Form S-1)

         99.2         SalesLogix Corporation 1999 Non-Employee Director Stock
                      Option Plan (incorporated by reference to Exhibit 10.6 to
                      the Registration Statement on Form S-1)

         99.3         SalesLogix Corporation 1999 Employee Stock Purchase Plan
                      (incorporated by reference to Exhibit 10.7 to the
                      Registration Statement on Form S-1)
</TABLE>


                                      II-5