West Dallas is an area consisting of many communities and neighborhoods in Dallas, Texas, United States. West Dallas is the area bounded by Interstate 30 on the south, the Trinity River on the east and north, and the Trinity River's West Fork on the west.

The Trinity River is a 710-mile (1,140 km) river, the longest with a watershed entirely within the U.S. state of Texas. It rises in extreme northern Texas, a few miles south of the Red River. The headwaters are separated by the high bluffs on the southern side of the Red River.