William Joseph Haselman (born May 25, 1966, in Long Branch, New Jersey) is a former Major League Baseball catcher. He played from 1990-2003 with the Texas Rangers, Seattle Mariners, Boston Red Sox and Detroit Tigers. He also served as the bullpen coach and first base coach for the Boston Red Sox.

During his 13-year playing career, Haselman hit .259 with 47 HR and 210 RBI. His best season came in 1996, when he hit .274 with 8 HR and 34 RBI in a career-high 237 AB for the Red Sox. He hit .314 with 6 HR in 105 AB for Texas in 1998. The former catcher was a first-round draft pick of the Rangers in 1987.