| Os de Balaguer | |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Province of Lleida#Catalonia#Spain |
| Pushpin Map Caption: | Location in Province of Lleida##Location in Catalonia##Location in Spain |
| Coordinates: | 41.8725°N 0.72°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Lleida |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Noguera |
| Leader Title: | Mayor |
| Leader Name: | Estefania Rufach Fontova (2015)[1] |
| Area Footnotes: | [2] |
| Area Total Km2: | 136.0 |
| Elevation M: | 463 |
| Population Density Km2: | auto |
| Postal Code Type: | Postal code |
| Postal Code: | 25610 |
Os de Balaguer (pronounced as /ca/) is a municipality in the comarca of Noguera, in the province of Lleida, Catalonia, Spain.
Economy is based on agriculture, with, in particular, the cultivation of vegetables, cereals and olive, and on animal husbandry as well.
Sights in the municipality include the rock paintings of Balma dels Vilars (included in the UNESCO World Heritage List and the former Augustianian monastery of Santa Maria de Bellpuig de les Avellanes.
Os de Balaguer was the birthplace of Gaspar de Portolá (1716–1784), governor of Baja and Alta California (1767 - 1770), explorer and founder of San Diego and Monterey.
The municipality is split into two parts, the bigger north-western part containing the village of Os de Balaguer, the smaller south-eastern part containing the village of Gerb.