John McNamara or Macnamara may refer to:
Politics John Macnamara (MP), MP for Leicester in the 1780s John McNamara (Australian politician) (fl. 1850s), New South Wales politician John Macnamara (1905–1944), British Army officer and politician John McNamara, mayor of Rockford, Illinois (1981–89)
Sports John J. McNamara (author) (1932–1986), banker, author and Olympic sailor John McNamara (baseball) (1932–2020), American baseball manager Jackie McNamara Sr. (born 1952), Scottish footballer Jackie McNamara (born 1973), Scottish footballer JT McNamara (1975–2016), Irish steeplechase jockey
Others John J. McNamara (1876–1941), one of the McNamara brothers who bombed the office of the Los Angeles Times in 1910 John Michael McNamara (1878–1960), American clergyman of the Roman Catholic Church John McNamara (VC) (1887–1918), recipient of the Victoria Cross John J. McNamara (architect) (fl. 1930s–1960s), American theater architect John Leo McNamara (1922–2004), Australian bushman, poet, historian and author John R. McNamara (1927–2001), U.S. Navy officer and Catholic bishop John McNamara (artist) (born 1950), American artist John McNamara (sportswriter) (1961/2–2018), sports reporter killed in the Capital Gazette shooting John McNamara (writer) (born 1962), co-creator of Profit John McNamara (fraudster) (fl. 1980s–1990s), Long-Island car dealer convicted of defrauding GMAC John McNamara (mathematical biologist), English mathematical biologist