Steven M. Biskupic (Croatian: Biskupić) (born March 26, 1961) is an American attorney who served as U.S. Attorney for the Eastern District of Wisconsin from 2002 to 2009 under Attorneys General John Ashcroft, Alberto Gonzales and Michael Mukasey. He was appointed by George W. Bush in May 2002.

Prior to his appointment, Biskupic served as an Assistant U.S. Attorney for 13 years, specializing in the prosecution of white-collar crime.

In 2007, Biskupic and his office came under review by US Congressional and Senate investigators looking at the 2006 Dismissal of U.S. Attorneys controversy. In 2010, the U.S. Department of Justice's internal affairs unit cleared Biskupic of any ethical wrongdoing in the Georgia Thompson prosecution.

Biskupic is one of nine siblings born to a Catholic family of Croatian and Irish descent. His brother, Vince Biskupic, formerly district attorney of Outagamie County, Wisconsin, was the Republican candidate for Attorney General of Wisconsin in 2002. Vince was named in 2014 by Governor Scott Walker to a judgeship on the Outagamie Circuit Court. Their sister, Joan, is a federal legal affairs reporter with Washington Week on PBS and USA Today.

Biskupic received his B.A. in Journalism from Marquette University in 1983 and his J.D. from Marquette in 1987.

Biskupic began serving in March 1989 as a criminal prosecutor in the United States Department of Justice. Prior to joining the United States Attorney's Office, he served for two years as a judicial law clerk to the late Robert W. Warren, United States District Judge for the Eastern District of Wisconsin.

Biskupic later worked on a series of high-profile public corruption and civil rights cases in Milwaukee, including the conviction of nine police officers, four Milwaukee aldermen, a state senator and several other public officials. Among Steven Biskupic's highest-profile prosecutions was against the Milwaukee police officers who beat Frank Jude Jr.

Biskupic is an adjunct professor of law at Marquette University Law School.