Brannan is a surname. Notable people with the surname include:
Real people
- Andy Brannan (1919–1997), Australian rules footballer
- Andrew Brannan (1948–2015), American Vietnam war veteran and criminal
- Charles F. Brannan (1903–1992), United States Secretary of Agriculture, 1948–1953
- John Brannan (1819–1892), American officer who served in the Civil War and Mexican–American War
- Mike Brannan (1955–2013), American golfer
- Samuel Brannan (1819–1889), American businessman and journalist
- Samuel S. Brannan (1835–1880), American politician and newspaper editor
- Solomon Brannan (born 1942), American football player
- Thomas Brannan (1893–1960), English rugby league footballer who played in the 1910s and 1920s
Fictional characters
- Josh Brannan, character in the NBC series Last Resort
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