James Brennan may refer to:
Politicians James F. Brennan (born 1952), American politician in the New York State Assembly James B. Brennan (1926–2021), American politician the Wisconsin State Senate James F. Brennan (mayor) (1916–2002), American politician, mayor of Somerville, Massachusetts James Brennan (Queensland politician) (1837–1917), Australian politician, member of the Queensland Legislative Assembly
Sports Don Brennan (baseball) (James Donald Brennan, 1903–1953), American Major League Baseball pitcher Jim Brennan (baseball) (1862–1914), American baseball player Jim Brennan (Australian footballer) (1927–2013), Australian rules footballer Jim Brennan (born 1977), Canadian soccer player and manager, also known as Jimmy Brennan Jim Brennan (Northern Irish footballer) (1932–2009), Northern Irish footballer James Brennan (footballer) (1884–1917), Irish footballer Jamie Brennan (born 1996/7), Irish Gaelic footballer Séamus Ó Braonáin (Jimmy Brennan, 1881–1970), Irish sportsman and public figure Jim Brennan (rugby union), Irish international rugby union player
Others
James Herbert Brennan (1940–2024), Northern Irish lecturer and author James Alexander Brennan (1885–1956), American songwriter James Brennan, a character in the film Adventureland