William Roger Fahey (FAY-hee) (born June 14, 1950) is an American former catcher in professional baseball who played for the Washington Senators / Texas Rangers (1971–1972, 1974–1977), San Diego Padres (1979–1980) and Detroit Tigers (1981–1983).

Bill Fahey played eleven seasons in the Major Leagues as a backup catcher.

He shared duties with Jim Sundberg in Texas, with Gene Tenace for San Diego and Lance Parrish in Detroit.

The next season, he posted career-highs in games (93), runs (18), hits (62) and RBI (22).

After his playing career ended, Fahey managed in the Detroit farm system, and was a Major League coach for the Tigers (1983) and San Francisco Giants (1986–91), serving as an aide to Roger Craig when Craig was the Tigers' pitching coach and then the Giants' manager.