| Klemen Kosi | |
| Gender: | m |
| Club: | SK Branik Maribor |
| Birth Date: | 19 June 1991 |
| Birth Place: | Maribor, Slovenia |
| Height: | 1.88 m |
| Wcdebut: | 6 March 2011 (age 19) |
| Olympicteams: | 1 – (2014) |
| Worldsteams: | 2 – (2013, 2015) |
| Wcseasons: | 5th (2011–2015) |
Klemen Kosi (born 19 June 1991 in Maribor) is a World Cup alpine ski racer from Slovenia.
Kosi made his World Cup debut March 2011 in Kranjska Gora, Slovenia. He participated at the 2013 World Ski Championships, where his best result was a 12th place in super combined. Kosi represented Slovenia at the 2014 Winter Olympics, where he reached 24th place in downhill.