Alexander Stewart (September 13, 1829 – May 24, 1912) was a member of the United States House of Representatives for Wisconsin.
Born in Fredericton, New Brunswick, Canada, Stewart moved to Wausau, Wisconsin, where he became involved in the lumber industry. Stewart was elected as a Republican to the Fifty-fourth, Fifty-fifth, and Fifty-sixth Congresses (March 4, 1895 – March 3, 1901). He represented Wisconsin's 9th congressional district. He did not run for reelection to the Fifty-seventh Congress.
He was a prominent person in the early days of Wausau and Stewart Avenue, one of the main roads in Wausau, is named in his honor. Stewart died in Washington, D.C. and was buried in the Pine Grove Cemetery in Wausau.