William Matthew Byrne Sr. (July 10, 1896 – March 9, 1974) was a United States district judge of the United States District Court for the Southern District of California.

William Matthew Byrne Sr.
California Central District Court
Chief Judge — U.S. District Court for the Southern District of California
Born 1896 in Bakersfield, CA
Died 1974
FJC ID: 340
- Gender
- Male
- Race
- White
Prior employment
- Superior Court of CaliforniaJudge · 1948–1950
- Los Angeles [California] Municipal CourtJudge · 1943–1948
- Private practice, Los Angeles, California1929–1943
- California State AssemblyMember · 1925–1931
- ↳speaker pro tem · 1927–1929
U.S. Navy1917–1919
Appointments
1966–1974 (None (reassignment))Term ended: Death
1950–1966 · Appointed by Harry S Truman (Democratic)Term ended: Reassignment
Education
- Loyola Law School, Los Angeles, CaliforniaLL.B. · 1929