Jack L. Middleton, 60, a prominent figure in Republican politics in Virginia who operated his own real estate and insurance brokerage business in The Plains, died Tuesday in a hospital in Tampa, Fla., after a stroke.

Mr. Middleton was chairman of the Virginia delegation to the Republican National Convention in 1968 and was a strong supporter that of Richard M. Nixon. He was a member of the Republican National Platform Committee at the national convention in Chicago in 1960. In 1964, he led Sen. Barry Goldwater's (R-Ariz.) successful quest for presidential delegates in Virginia.

Mr. Middleton was past-chairman of the 8th District Republican Committee and had been Republican finance chairman in Virginia. He had served on the National Republican Finance Committee.

He was a native of The Plains and was a 1943 graduate of the Virginia Polytechnic Institute where he earned a degree in business administration. He served with the Army in the Pacific during World War II and attained the rank of major.

He opened his insurance and real estate business, Jack L. Middleton Inc., in The Plains in 1948. He was active in the Lions Club, having served as district governor of Lions International and as a founder and board member of the Lions' Old Dominion Eye Bank in Richmond.

Mr. Middleton served on the board of trustees of the Virginia Council on Health and Medical Care and was a member of the Virginia Commission for the Visually Handicapped.

Survivors include his wife, Virginia Lee Middleton of The Plains; a brother, John P. Jr., also of The Plains; and a sister, Harriet Waldrop of Salem, Va.