John Avery Haldeman
- Bats Left, Throws Right
- Height 5' 10", Weight 175 lb.
- School Washington and Lee University
- Debut July 3, 1877
- Final Game July 3, 1877
- Born December 2, 1855 in Pewee Valley, KY USA
- Died September 17, 1899 in Louisville, KY USA
John Haldeman had been at Washington and Lee University from 1873-76 and came up for one game with the 1877 Louisville Grays at age 21, playing second base. Joe Gerhardt, who had a long career in the majors, was the regular second baseman that year.