William Poindexter Thomasson (October 8, 1797 – December 29, 1882) was a U.S. Representative from Kentucky.

He was admitted to the bar and commenced practice in Corydon, Indiana, before he was twenty-one years of age.

[1] During the Civil War, Thomasson served in the Union Army in the Seventy-first Regiment, New York Volunteer Infantry.

[1] Thomasson married Charlotte Leonard of Floyd County, Indiana in 1825.

[1] This article incorporates public domain material from the Biographical Directory of the United States Congress