Number Four
The expression Number Four can refer to:
- 4 (number), a number, numeral, and glyph
- A hamlet in the town of Watson, New York
- #4, the pseudonym of American musician Jim Root, when performing with Slipknot
- A character from the Earthworm Jim video games and animated series
- Numbuh Four, a character from Codename: Kids Next Door
- A predominantly defensive position in polo
- A character also known as Simon in the reimagined Battlestar Galactica.
- A character in the 2011 film I Am Number Four