Jeff Lastennet (born 26 August 1987 in Paris) is a French middle distance runner. He specializes in the 800 metres.
| Year | Competition | Venue | Position | Event | Notes |
|---|---|---|---|---|---|
| Representing France | |||||
| 2009 | European Team Championships | Leiria, Portugal | 3rd | 800 m | 1:48.29 s |
| Mediterranean Games | Pescara, Italy | 2nd | 800 m | 1:47.74 s | |
| World Championships | Berlin, Germany | 5th (sf) | 800 m | 1:57.43 s | |
| 2011 | European Team Championships | Stockholm, Sweden | 2nd | 800 m | 1:46.70 s |