| Marsac-sur-l'Isle | |
| Commune Status: | Commune |
| Arrondissement: | Périgueux |
| Canton: | Coulounieix-Chamiers |
| Insee: | 24256 |
| Postal Code: | 24430 |
| Mayor: | Yannick Bidaud[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Le Grand Périgueux |
| Coordinates: | 45.1858°N 0.6619°W |
| Elevation M: | 83 |
| Elevation Min M: | 71 |
| Elevation Max M: | 187 |
| Area Km2: | 10.05 |
Marsac-sur-l'Isle (in French pronounced as /maʁsak syʁ lil/, literally Marsac on the Isle; Occitan (post 1500);: Marsac d'Eila) is a commune in the Dordogne department in Nouvelle-Aquitaine in southwestern France.