Horn is a surname. Notable people with the surname include:

• Alan F. Horn (born 1943), American entertainment industry executive
• Alfred Aloysius "Trader" Horn (1861–1931), trader in Africa during the "Scramble for Africa"
• Alfred Horn (1918–2001), American mathematician
• Andrew Horn (died 1328) fishmonger, of Bridge Street, London, Chamberlain of the city (1320-8), author of Liber Horn
• Andrew Horn (filmmaker) (1952–2019), American film producer, director and writer
• Anton Ludwig Ernst Horn (1774-1848), German physician
• Count Arvid Horn (1664–1742), Swedish statesman
• Blair Horn, Canadian rower
• Bob Horn (broadcaster) (1916–1966), American radio and television personality
• Brita Horn (1745-1791), Swedish courtier and letter writer
• Bruce Horn (born 1960), American programmer
• Carl von Horn (1847–1923), Bavarian general and War Minister
• Carl von Horn (1903–1989), Swedish general
• Charles Edward Horn (1786-1849), English composer
• Cody Horn (born 1988), American actress and model
• Corran Horn, fictional character in Star Wars Legends
• Dave van Horn (born 1960), American baseball coach
• David Bayne Horn (1901–1969), British historian
• Dimitris Horn (1921–1998), Greek actor
• Don Horn (born 1945), American football quarterback
• Evert Horn (1585-1615), Swedish soldier
• Frederick W. Horn, American lawyer and politician
• Frederik Winkel-Horn (1756–1837), Danish writer
• Frederik Winkel Horn (1845–1898), Danish writer and translator
• Gabriel Horn (1927–2012), British biologist
• George Henry Horn (1840–1897), U.S. entomologist
• Greg Horn, American comic book artist
• Guildo Horn (born 1963), German singer
• Gustav Horn, Count of Pori (1592–1657), Swedish/Finnish soldier and politician
• Gyula Horn (1932–2013), Prime Minister of Hungary 1994–98
• Harvey Horn (born 1995), British boxer
• Hassa Horn Jr. (1873–1968), Norwegian engineer and industrialist
• Jaycee Horn (born 1999), American football player
• Jeff Horn, Australian boxer
• Jeremy Horn (born 1975), American mixed martial artist
• Jim Horn (born 1940), American musician
• Joan Kelly Horn (born 1936), Missourian politician
• Joe Horn (born 1972), American football player
• Joe Horn Jr. (born 1994), American football player & son of Joe Horn
• Joseph M. Horn, American psychologist
• Julian Horn-Smith, British businessman
• Kaniehtiio Horn (born 1986), Canadian actress
• Kate Horn (1826–1896), Canadian stage actress and director
• Karl Friedrich Horn (1762-1830), English composer
• Keith Van Horn (born 1975), American basketball player
• Kendra Horn, (1976-), US Representative (2019-)
• Laurence R. Horn (born 1945), American linguist
• Lawrence Horn (died 2017), American record producer
• Marie-Louise Horn (1912–1991), German tennis player
• Michael "J" Horn (born 1979), American musician and musical director
• Michelle Horn (born 1987), American actress
• Michiel Horn (born 1939), Canadian historian
• Mike Horn (born 1966), Swiss explorer and adventurer
• Milton Horn (1906–1995), Russian-American sculptor
• Noel Van Horn (born 1968), American born Canadian comic book artist
• Oliver Horn (1901-1960), American water polo player
• Paul Horn (musician) (1930–2014), American jazz flautist and saxophonist
• Paul Horn (computer scientist) (born 1946), American computer scientist and solid state physicist
• Philipp Horn (born 1994), German biathlete
• Philippe Emanuel de Hornes
• Rebecca Horn (born 1944), German installation artist
• Roni Horn (born 1955), American visual artist and writer
• Roy Horn (1944–2020), German-American entertainer
• Rudolf Horn (born 1954), Austrian biathlete and cross-country skier
• Sally P. Horn (born 1958), American geographer
• Sam Horn (born 1963), American baseball player
• Shifra Horn (born 1951), Israeli author
• Shirley Horn (1934–2005), American jazz singer and musician
• Siegbert Horn (1950–2016), East German slalom canoeist
• Siegfried Horn (1908–1993), American archaeologist and Bible scholar
• Spencer B. Horn (1895–1969), British soldier and World War I flying ace
• Steve Horn (1931–2011), university president and U.S. Congressman
• Ted Horn (1919–1948), American race car driver
• Timo Horn (born 1993), German professional footballer
• Tom Horn (1860–1903), American scout
• Tor Egil Horn (born 1976), Norwegian footballer
• Trevor Horn (born 1949), British musician
• Wade Horn (born 1976), American psychologist
• Walter Horn (1908–1995), German-born US academic
• Walther Hermann Richard Horn (1871–1939), German entomologist
• Welby Van Horn (1920–2014), American tennis player
• Werner D. Horn, American politician
• William Horn (1841–1922), Australian mining magnate, pastoralist, politician, author, sculptor and philanthropist
• William Van Horn (born 1939), American comic book artist

Families

• Horn family, Swedish nobility
• House of Hornes