William Raymond Brennan (born January 15, 1963) is a former pitcher in Major League Baseball. Brennan spent his high school years in Nashville, Tennessee and played for Bellevue and Hillwood High Schools. He was back with the Dukes for 1989 and then moved around, playing for the Tucson Toros (Houston Astros), Harrisburg Senators (Montreal Expos), Toledo Mud Hens (Detroit Tigers) and Iowa Cubs, before getting another chance in the bigs with the Chicago Cubs in 1993. He pitched in 8 games, making 1 start in '93. After one more season with Iowa, he was out of baseball after the 1994 season.