William Haskell Alsup (born June 27, 1945) is an American lawyer and jurist serving as senior United States district judge of the U.S. District Court for the Northern District of California. He was appointed to the Northern District of California in 1999 by President Bill Clinton and assumed senior status in 2021.

- Gender
- Male
- Race
- White
Prior employment
- Private practice, San Francisco, California1972–1978, 1980–1998, 1998–1999
Antitrust Division, U.S. Department of JusticeSpecial counsel · 1998
U.S. Department of JusticeAssistant to the solicitor general · 1978–1980
Law clerk , Hon. William O. Douglas · 1971–1972
Appointments
1999–2021 · Appointed by William J. Clinton (Democratic)
Education
J.D. · 1971- Harvard University, Kennedy School of GovernmentM.P.P. · 1971
- Mississippi State UniversityB.S. · 1967