EXHIBIT 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statements of Scientific-Atlanta, Inc. listed below of our reports dated August 24, 2005, with respect to the consolidated financial statements and schedule of Scientific-Atlanta, Inc., Scientific-Atlanta, Inc. management’s assessment of the effectiveness of internal control over financial reporting, and the effectiveness of internal control over financial reporting of Scientific-Atlanta, Inc., included in this Annual Report (Form 10-K) for the year ended July 1, 2005.

1. Registration Statements on Form S-8 covering the Scientific-Atlanta, Inc. 1978 Non-Qualified Stock Option Plan for Key Employees, as amended (File Nos. 2-72029, 33-5623, 33-20858, and 33-36926);

2. Registration Statements on Form S-8 covering the Scientific-Atlanta, Inc. 1981 Incentive Stock Option Plan (File Nos. 2-99889 and 33-781);

3. Registration Statements on Form S-8 covering the Scientific-Atlanta, Inc. Non-Employee Directors Stock Option Plan (File Nos. 33-35313 and 33-54696);

4. Registration Statements on Form S-8 covering the Scientific-Atlanta, Inc. Voluntary Employee Retirement and Investment Plan (File Nos. 33-69827, 333-64971 and 333-50066);

5. Registration Statement on Form S-8 covering the Scientific-Atlanta, Inc. 1992 Employee Stock Option Plan (File No. 33-69218);

6. Registration Statement on Form S-8 covering the Scientific-Atlanta, Inc. 1993 Restricted Stock Awards (File No. 33-52135);

7. Registration Statements on Form S-8 covering the 1994 Long-Term Incentive Plan of Scientific-Atlanta, Inc. (File Nos. 33-56449, 333-67932, 333-117103 and 333-67931);

8. Registration Statements on Form S-8 covering the Scientific-Atlanta, Inc. Stock Plan for Non-Employee Directors (File Nos. 33-64065 and 333-40217);

9. Registration Statements on Form S-8 covering the 1996 Employee Stock Option Plan (File Nos. 333-18893, 333-67471, 333-31968 and 333-56942);

10. Registration Statements on Form S-8 covering the Non-Qualified Stock Option Agreement with Employee (File Nos. 333-18891, 333-23083 and 33-52417);

11. Registration Statement on Form S-8 covering the 1998 Employee Stock Purchase Plan (File No. 333-62883);

12. Registration Statement on Form S-8 covering the 2003 Long-Term Incentive Plan of Scientific-Atlanta, Inc. (File No. 333-112753); and

13. Registration Statement on Form S-8 covering the Deferred Compensation Plan for Non-Employee Directors (File No. 333-50074).

Atlanta, Georgia

August 24, 2005