William Brennan
From Infogalactic: the planetary knowledge core
William Brennan may refer to:
- William Brennan (Australian politician) (1865–1937), member of the New South Wales Parliament
- William Brennan (baseball) (born 1963), Major League Baseball pitcher
- William C. Brennan (1918–2000), New York politician and judge
- William J. Brennan, Jr. (1906–1997), Justice of the United States Supreme Court
- William John Brennan (1938–2013), Australian Roman Catholic bishop
- Bill Brennan (boxer) (1893–1924), American boxer
- Bill Brennan (umpire) (1880–1933), Major League Baseball umpire and college football coach
- Billy Brennan (born 1934), ice hockey player
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