- Rabbit Ball (1906)
- Radar Gun (1975)
- Rainbow Curve (1882)
- Rally Cap (1975)
- Rally-Killing (1927)
- Red Sox Nation (1986)
- Rent a Player (1977)
- Retire in Order (1884)
- Retire the Side (1870)
- Right Fielder (1858)
- Right Off the Bat (1887)
- Rising Fastball (1915)
- Rob (1889)
- Roundhouse Curve (1896)
- Round-Tripper (1907)
- Rubber Arm (1910)
- Rundown Play (1904)
- Runner in Motion (1909)
- Runner in Scoring Position (1908)
- Ruthian (1919)
