Liston P. (Mac) McGowan, 66, retired marketing representative for the Sperry-Remington office machine division of the Sperry Rand Corp., died Monday at his home in Fairfax after a heart attack.

Mr. McGowan began his 45-year office machinery sales career with Remington Rand Inc. in Roanoke, Va., and also worked for the company in Richmond before transferring to the Washington office in 1946. He received a number of achievement awards, including salesman of the year in 1953 and in 1961. He retired in 1978. Remington Rand merged with the Sperry Corp. in 1955.

Following his retirement, Mr. McGowan was a consultant for the Federal Office Equipment Center in Washington.

He was born in Kenansville, N.C., and attended the University of Richmond.

During World War II, he was a master sergeant in the Army's First Armored Division and served as a tank commander in the European theater. His military decorations include four Bronze Star medals.

He lived in Farifax and was active in the Knox Presbyterian Church of Falls Church. He was a member of the Henry David Masonic Lodge in Fairfax and the Westwood Country Club in Vienna.

Survivors include his wife, the former Margaret Gillum, and a daughter, Carolyn Ann, both of Fairfax; another daughter, Diane McG. Murnane of Broad Run, Va.; a son, Wayne T., of Washington; two sisters, Margaret Veach of Elizabeth City, N.C., and Louise Edens of Wilmington, N.C., and a brother, Andrew, of Carolina Beach, N.C.

The family suggests that expressions of sympathy be in the form of contributions to the Heart Fund, or to a charity of one's choice.