| Leyritz-Moncassin | |
| Commune Status: | Commune |
| Arrondissement: | Nérac |
| Canton: | Les Forêts de Gascogne |
| Insee: | 47148 |
| Postal Code: | 47700 |
| Mayor: | Jean-Louis Boyance[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Coteaux et Landes de Gascogne |
| Coordinates: | 44.3281°N 0.1617°W |
| Elevation M: | 172 |
| Elevation Min M: | 45 |
| Elevation Max M: | 175 |
| Area Km2: | 20.24 |
Leyritz-Moncassin (in French pronounced as /lɛʁits mɔ̃kasɛ̃/; Occitan (post 1500);: Lairitz e Montcassin) is a commune in the Lot-et-Garonne department in south-western France.