UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D. C. 20549



                                    FORM 8-K



                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



         Date of Report (Date of earliest event reported): July 17, 2006



                                  ADTRAN, Inc.
             (Exact name of registrant as specified in its charter)

       Delaware                    0-24612                     63-0918200
 (State of Incorporation)  (Commission file number)        (I.R.S. Employer
                                                         Identification Number)



             901 Explorer Boulevard, Huntsville, Alabama 35806-2807
          (Address of principal executive offices, including zip code)



                                 (256) 963-8000
              (Registrant's telephone number, including area code)


Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions:

     |_|    Written communications pursuant to Rule 425 under the Securities Act
            (17 CFR 230.425)

     |_|    Soliciting material pursuant to Rule 14a-12 under the Exchange Act
            (17 CFR 240.14a-12)

     |_|    Pre-commencement communications pursuant to Rule 14d-2(b) under the
            Exchange Act (17 CFR 240.14d-2(b))

     |_|    Pre-commencement communications pursuant to Rule 13e-4(c) under the
            Exchange Act (17 CFR 240.13e-4(c))



Item 2.02.  Results of Operations and Financial Condition.

On July 17, 2006, ADTRAN, Inc. announced its financial results for the second
quarter ended June 30, 2006 and certain other information. ADTRAN also announced
that its Board of Directors declared a quarterly cash dividend. The quarterly
cash dividend is $0.09 per common share to be paid to holders of record at the
close of business on August 4, 2006. The ex-dividend date is August 2, 2006 and
the payment date is August 18, 2006. A copy of ADTRAN's press release announcing
such financial results and other information is attached as Exhibit 99.1 hereto
and incorporated by reference herein.


Item 9.01.  Financial Statements and Exhibits.

              (c)  Exhibits.

              The following exhibit is furnished as part of this Current Report
              on Form 8-K.

Exhibit Number          Description
--------------          -----------
     99.1               Press Release dated July 17, 2006



                                   SIGNATURES

        Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized on July 17, 2006.

                                 ADTRAN, Inc.
                                 (Registrant)

                                 By:/s/ James E. Matthews
                                 ---------------------------------
                                 James E. Matthews
                                 Senior Vice President - Finance,
                                 Chief Financial Officer and Treasurer



                                  EXHIBIT INDEX


Exhibit Number         Description
--------------         -----------
     99.1              Press Release dated July 17, 2006