Trillion is a number, either 1,000,000,000,000 (short scale) or 1,000,000,000,000,000,000 (long scale).
Trillion or Trillions may also refer to:
- Trillion (horse) (1974–1987), a French Thoroughbred racing mare
- Trillion (band), led by Dennis Frederiksen
- Trillion, a performer in the English hip pop quintet KING
- Trillions, a 1971 science fiction novel by Nicholas Fisk
- One trillion (basketball), specific box score of a basketball player
- Trilliant cut, or trillion, a triangular type of gemstone cut
- Trillion Fund, an equity crowdfunding platform