3/4 may refer to:
- The fraction (mathematics) three quarters (¾), equal to 0.75
- 3/4 time, a form of triple metre in music
- Three quarter pants
- 3/4 perspective in video games
- ¾" videocassette, better known as the U-matic format
- March 4 (month-day date notation)
- 3 April (day-month date notation)
- 3rd Battalion 4th Marines, a unit in the United States Marine Corps
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