William Alexander Smith (January 9, 1828 - May 16, 1888) was a U.S. Representative from the state of North Carolina.
Smith was born in Warren County, North Carolina and attended the common schools. He engaged in agricultural pursuits and was a member of the State constitutional convention in 1865 following the American Civil War. He was a member of the North Carolina State Senate in 1870. He was president of the North Carolina Railroad in 1868 and of the Yadkin River Railroad. He was elected as a Republican from the 4th District to the Forty-third Congress, serving from March 4, 1873 to March 3, 1875. Smith died in Richmond, Virginia and is interred in the city's Hollywood Cemetery.