Samuel Ealy Johnson Sr. (November 12, 1838 – February 25, 1915) was an American politician, businessman, farmer, and rancher.
Sam enlisted in Company B, 26th Texas Cavalry Regiment on September 18, 1861, and served until the end of the American Civil War on the coast of Texas and in Louisiana.
Johnson participated in the Battle of Galveston and the Red River Campaign in Louisiana.
After the war, he married Eliza Bunton of Caldwell County on December 11, 1867.
In the fall of 1892, Johnson was the Populist nominee for Blanco and Gillespie counties to the Texas House of Representatives.