Patricia Wyman Pinney, 55 a former employe of the Defense Department and a Washington area resident, died Friday in Rockport, Maine. She had cancer.

She was the wife of Eugene T. Pinney, a retired Foreign Service officer. They had moved to Rockport from Washington after his retirement in 1973.

Mrs. Pinney was born in San Francisco. Her father was the late Army Gen. Willard Wyman. She traveled extensively as a child to Army posts with her family and had lived at one time in China. She came here with her family in 1942.

She was a graduate of Mills College in Oakland, Calif. After the death of her first husband, Navy Lt. Victor Johnson, in an air crash in 1948, she went to work for the Defense Department in Washington. Later she was sent to Munich, Germany. She left the department in 1954 to marry Mr. Pinney and later accompanied him on assignments in Vienna, Austria; Belgrade, Yugoslavia, and Bern, Switzerland, with intermittent assignments in Washington.

They returned here for his last assignment in 1970.

In addition to her husband, she is survived by a son, Thomas, of Rockport, two daughters, Ellen, of Port Orford, Ore., and Nancy, of Minturn, Colo.; her mother, Ethel M. Wyman, of Washington, and a brother, Willard G. Wyman, of Ojai, Calif.

The family suggests that expressions of sympathy be in the form of contributions to the YMCA in Camden, Maine, or St. John the Baptist Episcopal Church in Camden.