Reiner may refer to:
- Reiner (crater), a crater on the Moon, named after Vincentio Reiner
- Reiner Township, Pennington County, Minnesota
People
- Reiner (given name)
- Reiner (surname)
Fictional characters
- Reiner Braun (Attack on Titan), a character in the manga series Attack on Titan
See also
- Rainer (disambiguation)
- Rainier (disambiguation)
- Rayner (disambiguation)
- Raynor
- Reiners
- Reyner