- Takeout Slide (1941)
- Take Sign (1932)
- Tear the Cover Off the Ball (1882)
- Texas Leaguer (1892)
- Throw Out the First Ball (1895)
- Tools of Ignorance (1929)
- Total Bases (1868)
- Trap (1889)
- Triple Play (1866)
- Two-Base Hit (1870)
Earliest uses of baseball terms