| Official Name: | Ba |
| Native Name: | Ба |
| Settlement Type: | Village (Selo) |
| Pushpin Map: | Serbia |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: |  Serbia |
| Subdivision Type1: | District |
| Subdivision Name1: | Kolubara District |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Ljig |
| Population As Of: | 2002 |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Coordinates: | 44.1583°N 20.1953°W |
Ba (Serbian: Ба) is a village in the municipality of Ljig in central Serbia. According to the 2002 census, the village has a population of 605.[1] It lies below Mount Suvobor.
During World War II, Ba was a stronghold of the Serbian royalist Chetnik movement. Between 25 and 28 January 1944, Chetniks led by Draža Mihailović met there for discussion in what became known as the Ba Congress. For that reason the village was neglected by post-war Communist authorities.[2]