John Thadeuz Halama
- Bats Left, Throws Left
- Height 6' 5", Weight 210 lb.
- High School Bishop Ford Central Catholic High School
- School St. Francis College
- Debut April 2, 1998
- Final Game June 10, 2006
- Born February 22, 1972 in Brooklyn, NY USA
In 1999, John Halama tied the Seattle Mariners team record of 9 wins in a row. One of the wins, a complete game shutout over the Texas Rangers, was the Mariners' first complete game shutout in 90 games.
On July 7, 2001, Halama threw the first nine-inning perfect game in Pacific Coast League history. His Tacoma Rainiers topped the Calgary Cannons 6-0 and earned Halama a return trip to the big leagues (he had been demoted on June 28th).
Halama became a pitching coach with the York Revolution in 2013.