U8 may refer to:
- U8, a line on the Berlin U-Bahn
- U8 Global Student Partnership for Development
- German submarine U-8, one of several German submarines
- Yangwang U8, a luxury SUV by BYD Auto
- the IATA code for Armavia airline
- another designation for the Beechcraft L-23 Seminole
- Ultima VIII: Pagan, a video game
u8, a name for the 8-bit unsigned integer, especially in Rust
