MacSween and McSween are surnames of Gaelic origin. People with those surnames include:

• Alexander McSween (c.1843–1878), Canadian-American participant in the Lincoln County War of 1878
• Donald McSween (born 1964), American ice hockey player
• Harold B. McSween (1926–2002), U.S. Representative from Louisiana.
• Harry McSween (born 1945), American geologist and planetologist
• John MacSween (fl. 1310), Scottish nobleman
• John Macsween (entrepreneur) (1939–2006), Scottish butcher and entrepreneur
• Roderick MacSween (born 1935), Scottish pathologist
• Susan McSween (1845–1931), American rancher

• Macsween (butcher), Scottish food company known for haggis
• Clan MacQueen, a Scottish clan also known as Clan MacSween
• Mac Suibhne (surname)
• 5223 McSween, an asteroid named after Harry McSween
• Barry MacSweeney (1948–2000), English poet and journalist
• McSweeney (surname)
• Castle Sween, a Scottish castle associated with Clan Sweeney
• Sweeney (name)
• Clan Sweeney (also known as Clan MacSweeney), an Irish clan of Scottish origin
• Mary MacSwiney (1872–1942), Irish politician and educationalist
• All pages with titles containing MacSween
• All pages with titles containing McSween