McWilliams is a surname. Notable people with the surname include:
Alfred McWilliams (b. 1844, d. unknown), Canadian politician from Prince Edward IslandBill McWilliams (1910–1997), American professional baseball playerBrendan McWilliams (1944–2007), Irish meteorologist and science writerCarey McWilliams (1905–1980), American author, editor, and lawyerCarey McWilliams (b. 1973), American author, marksman, and skydiverCaroline McWilliams (b. 1945), American television actress; former wife of Michael KeatonChristopher 'Crip' McWilliams (1963–2008), Irish nationalist; convicted of the murder of the LVF leader Billy WrightCynthia Kaye McWilliams (contemporary), American actressDavid McWilliams (contemporary), American college football coachDavid McWilliams (1945–2002), Northern Irish singer, songwriter, and guitaristDavid McWilliams (b. 1966), Irish economist, commentator, and authorDerek McWilliams (b. 1966), Scottish professional football playerEdmund McWilliams (contemporary), American diplomat and ambassadorElsie McWilliams (1896-1985), American songwriterEric McWilliams (b. 1950), American professional basketball playerFleming McWilliams (contemporary), American singer and songwriterGeorge McWilliams (1865–1907), Australian doctor and MPJackie McWilliams (b. 1964), Irish Olympic field hockey playerJeremy McWilliams (b. 1964), Irish motorcycle road racerJoe McWilliams (1904–1996), American inventor, industrial engineer, and nationalistJohn D. McWilliams (1891–1975), American politician from Connecticut; U.S. Representative 1943–45Johnny McWilliams (b. 1972), American professional football playerLarry McWilliams (b. 1954), American professional baseball playerMonica McWilliams (b. 1954), Northern Ireland academic and politicianPeter McWilliams (1949–2000), American marijuana activist and writerRhys McWilliams (b. 1985), English professional ice hockey playerRoland Fairbairn McWilliams (1874–1957), Canadian politician from ManitobaRuben McWilliams (1901–1984), New Zealand All Blacks rugby playerShorty McWilliams (1926–1997), American football playerTaj McWilliams-Franklin (b. 1970), American professional women’s basketball playerWilliam McWilliams (1856–1929), Australian politician from TasmaniaWilson Carey McWilliams (1933–2005), American political scientist and writer