Sabine County is a county located on the central eastern border of the U.S. state of Texas. As of the 2020 census, its population was 9,894. The county was organized on December 14, 1837, and named for the Sabine River, which forms its eastern border.

The Sabine River is a 360-mile (580 km) long river in the Southern U.S. states of Texas and Louisiana, From the 32nd parallel north and downstream, it serves as part of the boundary between the two states and empties into Sabine Lake, an estuary of the Gulf of Mexico.