William Walter "Bill" Mercer (born 1964) is an American attorney and politician serving as a United States district judge of the United States District Court for the District of Montana. He served as a member of the Montana House of Representatives from 2019 to 2025. He previously served as the United States attorney for the District of Montana, as well as principal associate deputy attorney general for the United States Department of Justice. Mercer served as acting associate attorney general under President George W. Bush. He resigned before his confirmation hearing could take place.
- Gender
- Male
- Race
- White
Prior employment
- Private practice, Billings, Montana2010–2025
U.S. attorney for the District of Montana2001–2009- U.S. Department of Justice2005–2007
- ↳principal associate deputy attorney general · 2005–2006
- ↳acting associate attorney general · 2006–2007
- District of MontanaAssistant U.S. attorney · 1994–2001
- University of MontanaAdjunct faculty · 1997–1999
- Montana State University--BillingsAdjunct faculty · 1996
- U.S. Department of JusticeAttorney advisor · 1994
Appointments
2025–present · Appointed by Donald J. Trump (Republican)
Education
- George Mason University School of Law (now Antonin Scalia Law School)J.D. · 1993
- Harvard UniversityM.P.A. · 1988
- University of MontanaB.A. · 1986