Dr. Frederick Mayer, 84, a psychiatrist who retired from the Veterans Administration in 1963 after more than 30 years of government service, died of pneumonia Saturday at George Washington University Hospital.

Dr. Mayer was born in Frankfurtam-Main, Germany, and earned his medical degree from the University of Frankfurt in 1920. He moved to the United States in 1923 and spent the next several years working at various New York state hospitals.

He began his career with the VA in 1930. His medical specialty was psychoneurology, the treatment of injuries to the nervous system. He worked at VA facilities in New York, Washington, South Carolina and Kentucky, where he was chief of the VA Mental Hygiene Clinic at Louisville at the time of his retirement in 1963.

Dr. Mayer moved to Arlington after his retirement and lived there for the rest of his life. He was a consultant to the VA and to the American Red Cross following his retirement. He also traveled widely as a member of the Shillelagh Travel Club.

During World War II, Dr. Mayer served in the Army, rising to the rank of major.

His wife, Mary Catherine Mayer, died in 1966.

Survivors include a son, Jacob W., of Arlington; a sister, Rosa Zucker, of Jerusalem, amd two grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to Children's Hospital, Washington, D.C. CAPTION: Picture; DR. FREDERICK MAYER