| Fretin | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason de la ville de Fretin (59) Nord-France.svg |
| Arrondissement: | Lille |
| Canton: | Templeuve-en-Pévèle |
| Insee: | 59256 |
| Postal Code: | 59273 |
| Mayor: | Marie-Jeanne Marseguerra[1] |
| Term: | 2023 - 2026 |
| Intercommunality: | Métropole Européenne de Lille |
| Coordinates: | 50.5581°N 3.135°W |
| Elevation M: | 34 |
| Elevation Min M: | 25 |
| Elevation Max M: | 54 |
| Area Km2: | 13.17 |
Fretin (pronounced as /fr/) is a commune in the Nord department in northern France.[2] It is in the south of the Métropole Européenne de Lille.
It contains the Fretin triangle, a high speed flying junction joining the HSL 1 railway line from Brussels to the LGV Nord from Paris to the Channel Tunnel.