Moncassin | |
|---|---|
![]() Location of Moncassin | |
Location within France Location within Occitanie | |
| Coordinates: 43°27′16″N 0°28′49″E / 43.4544°N 0.4803°E | |
| Country | France |
| Region | Occitania |
| Department | Gers |
| Arrondissement | Mirande |
| Canton | Mirande-Astarac |
| Government | |
| • Mayor (2020–2026) | Jean-Claude Verdier |
Area 1 | 13.93 km2 (5.38 sq mi) |
| Elevation | 169 m (554 ft) |
| Highest elevation | 283 m (928 ft) |
| Lowest elevation | 179 m (587 ft) |
| Population (2023) | 123 |
| • Density | 8.83/km2 (22.9/sq mi) |
| Time zone | UTC+01:00 (CET) |
| • Summer (DST) | UTC+02:00 (CEST) |
| INSEE/Postal code | 32263 /32300 |
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Moncassin (French pronunciation: [mɔ̃kasɛ̃]; Occitan: Montcassin) is a commune in the Gers department in southwestern France.

The Petite Baïse flows north through the middle of the commune and forms parts of its northern border.
| Year | Pop. | ±% p.a. |
|---|---|---|
| 1968 | 177 | — |
| 1975 | 151 | −2.24% |
| 1982 | 138 | −1.28% |
| 1990 | 122 | −1.53% |
| 1999 | 119 | −0.28% |
| 2007 | 126 | +0.72% |
| 2012 | 137 | +1.69% |
| 2017 | 134 | −0.44% |
| 2023 | 123 | −1.42% |
| Source: INSEE | ||