84 may refer to:
- 84 (number)
- one of the years 84 BC, AD 84, 1984, AD 2084
- 84 Lumber, a building materials supply company
- Eighty Four, Pennsylvania, an unincorporated census-designated place in Washington County, Pennsylvania, United States
- Seksendört, a Turkish pop group whose name means 84
- 84 Klio, a minor planet part of the Asteroid belt