Fred J. Bittner, 64, an auditor with the Central Intelligence Agency for 25 years before retiring in 1975, died Sunday at the home of his daughter, Maureen B. Krug, in Springfield. He had cancer.

A former resident of Vienna, Mr. Bittner had made his home in Montross, Va., since his retirement.

Mr. Bittner was a member of Our Lady of Good Counsel Catholic Church in Vienna and of the Knights of Columbus in Arlington. He belonged to the Ancient Order of Hibernians.

He was a native of Brooklyn and a graduate of Niagara University in New York. He served with the Army's Eighth Air Force in Europe during World War II. He lived in New York before moving here in 1950.

In addition to his daughter, Mr. Bittner's survivors include his wife, the former Kathleen Lyons of Montross; three sons, Fred J., of Stow, Mass., Navy Petty Officer Frank X. Bittner, of South Carolina, and Robert C., of Houston, Tex.; a brother, Frank X., of Glen Cove, N.Y.; seven sisters, Marie Riley of Fresh Meadows, N.Y., Adelaide Roche of Bronxville, N.Y., Jean Coan of South Amboy, N.J., Gertrude Blake and Irene Bittner, both of Williston Park, N.Y., and Anne Banting and Dorothy Audubon, both of Largo, Fla., and five grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Hospice of Northern Virginia in Arlington.