- three-base hit
- three-card monte
- three-color
- three-decker
- three-dimensional
- three-gaited
- three-legged race
- Three Mile Island
- three-mile limit
- threepence
- threepences
- threepenny
- three-piece
- three-ply
- three-point landing
- three-quarter
- three-quarter binding
- three-ring circus
- Three Rivers Community College
- three R's
- threes
- threescore
- threesome
- threesomes
- three-spine stickleback