| Nationality: | Spanish |
| Birth Date: | 27 January 1987 |
| Birth Place: | Palencia, Spain |
| Show-Medals: | yes |
Diego Cosgaya (born 27 January 1987) is a Spanish sprint canoer who has competed since the late 2000s. He won a gold medal in the K-2 1000 m event at the 2009 ICF Canoe Sprint World Championships in Dartmouth, Nova Scotia.