| State: | TX |
| Type: | Farm |
| Route: | 331 |
| Length Mi: | 11.685 |
| Length Ref: | [1] |
| Length Round: | 3 |
| Map Custom: | yes |
| Established: | 1945 |
| Direction A: | South |
| Direction B: | North |
| Terminus A: | north of Sealy |
| Terminus B: | Oil Field Rd. near Raccoon Bend |
| Counties: | Austin |
| Previous Type: | Farm |
| Previous Route: | 330 |
| Next Type: | Farm |
| Next Route: | 332 |
Farm to Market Road 331 (FM 331) is a farm to market road in eastern Austin County, Texas.
FM 331 begins at an intersection with SH 36 north of Sealy. The route travels to the north into the small community of Burleigh, where it has a brief concurrency with FM 529. It continues northward, roughly paralleling the Brazos River to its east, before state maintenance ends at Oil Field Road near the community of Raccoon Bend. Oil Field Road continues into the town and provides access to SH 159.
FM 331 was originally designated along a 70NaN0 stretch from SH 159 in Bellville to Burleigh on June 16, 1945. On October 31, 1958, the highway was extended southward 6.3miles from Burleigh to SH 36 southeast of Peters. The highway was rerouted on April 6, 1970, when the original section from Bellville to Burleigh was redesignated as part of FM 529; the section north of Burleigh to Raccoon Bend, which was formerly FM 2916, was also added to the route.