R
- "The Rabbi of Swat" = Moe Solomon, American outfielder
- "Rabbit" = Walter Maranville, American baseball player
- "Rajah" = Rogers Hornsby, American second baseman
- "The Reading Rifle" = Carl Furillo, American baseball player
- "Rapid Robert" = Bob Feller, American starting pitcher (baseball player)
- "Red" =
- Urban Clarence Faber, United States baseball player
- John Murray, United States baseball player
- Charles Ruffing, United States baseball player
- Albert Schoendienst, American second baseman and manager
- "Red Baron" = Rick Sutcliffe, American starting pitcher
- "Red Beard" = Rick Sutcliffe, American starting pitcher
- "Red Light Curt" = Curt Schilling, American starting pitcher
- "The Riot" = Ryan Theriot, United States baseball player
- "Ripper" = James Collins, United States baseball player
- "The Rocket" = Roger Clemens, American starting pitcher
- "Russell the Muscle" = Russell Martin American catcher
- "Rusty" = Daniel Staub, American outfielder
- "Ryan Express" = Nolan Ryan, American starting pitcher
- "Ryno" = Ryne Sandberg, American second baseman
Read more about this topic: List Of Baseball Player Nicknames