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): April 16, 2007

                                  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 April 16, 2007, ADTRAN, Inc. announced its financial results for the fiscal
quarter ended March 31, 2007 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 May 3, 2007. The ex-dividend date
is May 1, 2007 and the payment date is May 17, 2007.

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

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 April 16, 2007


              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 April
16, 2007.

                                           ADTRAN, Inc.

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

                                  EXHIBIT INDEX

Exhibit Number        Description
--------------        -----------

    99.1              Press Release dated April 16, 2007