Alsa is an unincorporated community in Van Zandt County, Texas, United States. According to the Handbook of Texas, the community had a population of 30 in 2000.
Alsa, a farming community eight miles north of Wills Point in northwestern Van Zandt County, had a post office from 1894 to 1907. According to one source the town was established by Bill Starnes, a Confederate veteran who opened a store shortly after the Civil War and named the settlement for his boyhood sweetheart. Alsa school, established after 1890, joined the Wills Point Independent School District in the early 1950s.