| Montgai | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Catalonia |
| Pushpin Map Caption: | Location in Catalonia |
| Coordinates: | 41.7997°N 0.9608°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Lleida |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Noguera |
| Leader Title: | Mayor |
| Leader Name: | Jaume Gilabert Torruella (2015)[1] |
| Unit Pref: | Metric |
| Area Footnotes: | [2] |
| Area Total Km2: | 28.9 |
| Elevation M: | 286 |
| Population Density Km2: | auto |
| Postal Code: | 25616 |
Montgai (in Catalan; Valencian pronounced as /moŋˈgaj/) is a municipality in the province of Lleida and autonomous community of Catalonia, Spain. It is situated in the valley of the river Sió among the hills of Bellmunt in the south and the mountains of Montclar in the north.
The municipality consists of two villages: Montgai and Butsènit d'Urgell.
The economy is based in the agricultural activities. The expansion of cultivated land is quite divided between dry and irrigated land.
In the 20th century Montgai had 27 houses, and increased the number of inhabitants until the 1930s. Then, it started a decrease because of economic crisis in the agriculture, and today there are 663 citizens.
In the middle of the village there is the church Mare de Déu de l'Assumpció, built in the mid-eighteenth century.