Brun, Brün or de Brún is a surname. Notable people with the surname include:

• Ane Brun (born 1976), Norwegian singer/songwriter
• Bairbre de Brún (born 1954), Irish politician
• Charles Brun (France) (1821–1897), French Navy engineer and politician
• Charles Brun (Denmark) (1866–1919), Danish politician
• Eske Brun (1904–1987), politician in Greenland
• Frédéric Brun (writer) (born 1960), French writer
• Friederike Brun (1765–1835), Danish author and salonist
• Herbert Brün (1918–2000), German-American composer of electronic music
• Johan Nordahl Brun (1745–1816), Norwegian poet, dramatist, bishop, and politician
• Johanne Brun (1874–1954), Danish opera singer
• Johannes Brun (1832-1890), Norwegian stage actor
• Johannes Brun (officer) (1891-1977), Norwegian military officer and bridge champion
• Joseph C. Brun (1907-1998), French-American cinematographer
• Marie-Marguerite Brun (1713–1794), French lexicographer and poet
• Pádraig de Brún (1889–1960), Irish clergyman, mathematician and classical scholar
• Philippe Brun (musician) (1908–1994), French jazz trumpeter
• Philippe Brun (politician) (born 1991), French politician
• Roy Brun (born 1953), American judge and politician
• Rudolf Brun (1290s–1360), leader of the Zürich guilds' revolution of 1336 and the city's first independent mayor
• Thomas Brun, 12th century clerk of King Henry I of England and almoner of King Henry II
• Viggo Brun (1885–1978), Norwegian professor and mathematician
• Walter Brun (born 1942), Swiss former racing driver and founder of Brun Motorsport, an auto racing team

See also

• Brune (disambiguation), including surname
• Brunn (surname)
• Brunne, a surname
• Lebrun, a list of people with the surname or given name