Steven Troy Marshall (born October 26, 1964) is an American lawyer serving as the 48th attorney general of Alabama. He was appointed in February 2017 by Governor Robert J. Bentley to fill the vacancy created by previous attorney general Luther Strange's appointment to the United States Senate. He was elected to a full term in 2018, and was re-elected in 2022. He previously served as district attorney in Marshall County for 16 years.

In May 2025, he announced his candidacy for the U.S. Senate in the 2026 election succeeding to replace Tommy Tuberville, who is running for governor.

Marshall was born in Atmore, Alabama, the only child of Conrad Marshall, a representative for a sporting goods manufacturer, and Mary Jo Marshall (née' Everette), a secretary. He graduated from Pinecrest High School in Southern Pines, North Carolina, and earned a bachelor's degree in American studies from the University of North Carolina at Chapel Hill in 1987. He then earned a J.D. degree at the University of Alabama School of Law, and was admitted to the Alabama State Bar in 1990.

Marshall practiced law in Birmingham and Montgomery in the firm of Maynard Cooper and Gale P.C. and then moved to Guntersville where he started the firm of McLaughlin & Marshall. He was district representative for Alabama and Georgia in the American Bar Association. In addition to private practice, he served as a legal analyst for the Alabama House of Representatives, as prosecutor for the Arab and Albertville municipal courts and as municipal attorney for Arab.

In 2001, on the retirement of Ronald Thompson, he was appointed Marshall County District Attorney by Alabama Governor Don Siegelman, the second youngest district attorney in the state at the time. Marshall was unopposed in three subsequent elections. As district attorney, he assisted in passage of the Brody Act, which makes injury to a fetus an offense punishable in addition to any injury to the mother, and of a state law requiring a driver's license for the purchase of ephedrine and pseudoephedrine, ingredients used in manufacturing crystal meth.

In 2011, after serving for ten years as Marshall County district attorney, Marshall officially changed his political party affiliation from the Democratic Party to the Republican Party.

Marshall was appointed Attorney General of Alabama by Governor Robert J. Bentley in February 2017, to fill the vacancy caused by Luther Strange's appointment to the United States Senate. He was elected to a full term in 2018, defeating former attorney general Troy King in a July run-off election.

In August 2017, Birmingham Mayor William A. Bell draped a Confederate memorial with plastic and surrounded it with plywood with the rationale that the county should not glorify such memorials. Marshall sued Bell and the city for violating the Alabama Memorial Preservation Act, which prohibits the "relocation, removal, alteration, or other disturbance of any monument on public property that has been in place for 40 years or more".