- Irwandia Lakasek
- Irwell
- Irwell (New Zealand River)
- Irwin
- Irwindale
- Irwindale (Los Angeles metro)
- Irwinton
- Irwin (Idaho)
- Irwin (Illinois)
- Irwin (Iowa)
- Irwin (Pennsylvania)
- Irwin Allen
- Irwin Bazelon
- Irwin Chanin
- Irwin Corey
- Irwin Cotler
- Irwin Dambrot
- Irwin Gage
- Irwin Goodman
- Irwin Hasen
- Irwin Keyes
- Irwin Kostal
- Irwin LaRocque
- Irwin M. Wall
- Irwin McIntosh
- Irwin R. Blacker
- Irwin Rose
- Irwin Shapiro
- Irwin Shaw
- Irwin Stone
- Irwin Unger
- Irwin Winkler