Roy Drake Witte Sr., 55, who had been in the computer industry in Washington for about 30 years, died Jan. 7 at his home in Annapolis. He had cancer.

Mr. Witt began working in computers in Washington after World War II. He worked for the Burroughs Corporation in Washington during the 1950s, and later was a partner in the computer hardware corporation of Word Processing Products in Bethesda.

He had lived in Hagerstown for 20 years before moving to Annapolis about a year and a half ago. Since that time he had been owner of Yachts Inc., an Annapolis yacht brokerage and charter firm.

Mr. Witte was a native of Birmingham, Ala., and a graduate of Washington & Lee University in Lexington, Va. He was a navigator in the Army Air Corps in Italy during World War II and was awarded the Purple Heart Medal.

His wife, Agnes Morrison Witte, died Dec. 10, 1979.

Survivors include five daughters, Kathleen W. Hawkins, Martha B. Witte, Rosamond M. Witte, Anne H. Witte, and Mary K. Witte, all of Annapolis; a son, Roy D. Jr., of Annapolis; a sister, Mary Neil Long of Norfolk; a brother, Quintus, also of Norfolk, and one grandchild.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society, or to the Western Maryland Chapter of the American Heart Association in Hagerstown.