John Daskam Mitchell, 67, who was a member of the U.S. Postal Service's labor negotiations team, director of its Office of Contract Analysis, and a retired vice president of the Collins Radio Co. of Dallas, died Friday at Fairfax Hospital of complications following heart surgery.

Mr. Mitchell, who lived in Annandale, joined the Postal Service in 1972, after retiring as vice president for labor relations for the Collins Radio Co.

Mr. Mitchell was born in Cresco, Iowa, and graduated from the University of Minnesota, where he studied aeronautical engineering. He was in the Army Army Air Corps during World War II and was assigned to the Air Transport Command here and in Europe. He rose to the rank of lieutenant colonel.

Mr. Collins was an airline executive before the war and again after the war until he joined Collins Radio in 1952.

Survivors include his wife, Ruth, of Annandale; a son, Stephen D., of Dallas; a daughter, Candace M. Robinson of Schaumburg, Ill., a stepson, Frank Mitchell Dana of New York City; a brother James L., of Los Angeles, and a sister, Mary Kathryn Duncan of Chicago.

The family suggests that expressions of sympathy be in the form of contributions to the Heart Fund of the American Heart Association.