Alexander Stuart Wallace (December 30, 1810 – June 27, 1893) was a U.S. Representative from South Carolina.

Alexander Stuart Wallace
Member of the U.S. House of Representatives from South Carolina's 4th district
In office May 27, 1870 – March 3, 1877
Preceded by	James H. Goss
Succeeded by	John H. Evins
Member of the South Carolina House of Representatives from York District
In office November 27, 1865 – August 5, 1866
In office November 22, 1858 – December 22, 1859
In office November 22, 1852 – December 19, 1855
Personal details
Born	(1810-12-30)December 30, 1810 York, South Carolina, U.S.
Died	June 27, 1893(1893-06-27) (aged 82) York, South Carolina, U.S.
Resting place	Rose Hill Cemetery
Political party	Republican
Other political affiliations	Unionist

The son of American colonial immigrant McCasland Wallace (born at sea on the Atlantic Ocean to a Scots-Irish family on their way to the port of Charleston, South Carolina), Wallace was born near York, South Carolina and received limited schooling. He engaged in planting in his native county.

He served as member of the South Carolina House of Representatives from 1852 to 1855, from 1858 to 1859 under the Unionist banner. When South Carolina seceded from the Union he withdrew from politics. He quietly refrained from supporting the Confederacy in any way during the war years, though this was a situation he had to navigate carefully, as his earlier Unionist sympathies made him a target. After the war he immediately joined the Republican Party. He successfully contested as a Republican the election of William D. Simpson to the Forty-first Congress. South Carolina's 1868 Constitution barred ex-confederates from voting but did give the franchise to newly freed African-Americans. As a result, most people eligible to vote in the next several elections were African-Americans, northern military officers who had stayed in South Carolina after the war, and whites who worked for the Freedmen's Bureau, all of whom overwhelmingly supported the Republican Party. Under these circumstances Wallace was reelected to the Forty-second, Forty-third, and Forty-fourth Congresses and served from May 27, 1870, to March 3, 1877. He served as chairman of the Committee on Revolutionary Claims (Forty-second Congress). He was an unsuccessful candidate for reelection in 1876 to the Forty-fifth Congress. He engaged in agricultural pursuits until his death near York, South Carolina, June 27, 1893.

He was interred at Rose Hill Cemetery in York.