William Brennan
Appearance
William Brennan may refer to:
- William Brennan (1865–1937), member of the New South Wales Parliament
- William Brennan (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
- William Joseph Brennan (1904–1975), Roman Catholic priest in Australia
- Willis Brennan (1893–1950), American football player
- Willy Brennan, Irish highwayman
- Bill Brennan (1880–1933), Major League Baseball umpire and college football coach
- Bill Brennan (1893–1924), American boxer
- Bill Brennan (born 1968), candidate for Governor of New Jersey in 2017
- Bill Brennan, sports journalist
- Billy Brennan (born 1934), ice hockey player