Dorn (German for thorn) is a German/Austrian and Dutch/Flemish surname. Notable people with the surname include:

• Angela Dorn-Rancke, née Dorn, German politician
• August T. Dorn (1849-1923), American politician
• Dieter Dorn (born 1935), German theatre director
• Dolores Dorn (1934–2019), American film actor
• Edward John Dorn (1854-1937), United States Naval officer and Governor of Guam
• Ed Dorn (1929–1999), U.S. poet
• Earl Van Dorn (1820–1863), U.S. major general
• Friedrich Ernst Dorn (1848–1916), German physicist
• Francis E. Dorn (1911–1987), member of the United States House of Representatives
• George W. Dorn (1836–1891), President of the Chico Board of Trustees in 1872
• Gerhard Dorn (c. 1530 – 1584), Belgian philosopher, translator, alchemist, physician and bibliophile
• Heinrich Dorn (1804–1892), German conductor and composer
• Ivan Dorn (born 1988), Ukrainian singer, DJ, TV presenter and producer
• Jennifer Dunbar Dorn, English writer and filmmaker
• Jerry verDorn (1948–2022), American actor
• Joel Dorn (1942–2007), music producer
• Johannes Albrecht Bernhard Dorn (1805–1881), German orientalist
• Ludwik Dorn (1954–2022), Polish politician
• Luke Dorn (born 1982), rugby player
• Michael Dorn (born 1952), U.S. actor
• Myles Dorn (born 1998), American football player
• Robert C. Dorn, New York politician
• Roosevelt F. Dorn (born 1935), mayor
• Rüdiger Dorn (born 1969), game designer
• Thea Dorn (born 1970), German writer
• Walter Dorn (born 1961), scientist, educator, author and researcher
• William Jennings Bryan Dorn (1916–2005), U.S. politician
• Wulf Dorn (born 1969), German novelist

Fictional characters:

• Fandorin, a fictitious Russian surname derived from von Dorn
• Van Dorn Detective Agency, a fictitious detective agency in a series of novels by Clive Cussler
• Dorn Marto, a character in the video game Star Ocean
• Eliot Dorn, character on The Edge of Night
• Rogal Dorn, one of the twenty primarchs and leader of the Imperial Fists in table top game Warhammer 40,000
• Roger Dorn (played by Corbin Bernsen), third baseman for the Cleveland Indians in the 1989 movie Major League (film), the 1994 sequel Major League II and the 1998 third installment "Major League: Back to the Minors"
• Chris Dorn and son Kurt Dorn, wheat farmers in Zane Grey's 1919 novel The Desert of Wheat