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): January 23, 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 (see General Instruction A.2. below):

     |_|      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 January 23, 2006, ADTRAN, Inc. announced its financial results for the fiscal
quarter and year ended December 31, 2005 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 February 7, 2006. The ex-dividend date is
February 3, 2006 and the payment date is February 17, 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 January 23, 2006


              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 January
23, 2006.

                                  ADTRAN, Inc.

                                  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 January 23, 2006