Barth is a surname. Notable people with the surname include:
- Auguste Barth (1834–1916), French orientalist
- Belle Barth (1911–1971), Jewish-American entertainer
- Carl Georg Barth (1860–1939), Norwegian-American mathematician and mechanical engineer
- Charles H. Barth (1858–1926), American Brigadier general
- Christian Gottlob Barth (1799–1862), German Protestant minister, writer and publisher
- Connor Barth (born 1986), American football player
- Edgar Barth (1917–1965), German race-car driver
- Edvard Kaurin Barth (1913–1996), Norwegian zoologist and photographer, husband of Sonja
- Emil Barth (1879–1941), German socialist politician and revolutionary
- Fredrik Barth (1928–2016), Norwegian anthropologist
- Fredy Barth (born 1979), Swiss race-car driver
- Heinrich Barth (1821–1865), German explorer
- Heinz Barth (1920–2007), German Waffen-SS leader and war criminal
- Janet Barth, American radiation engineer
- John Barth (1930–2024), American novelist and short-story writer
- Joseph Barth (1746–1818), Austrian ophthalmologist
- Jürgen Barth (born 1947), German engineer and racecar driver
- Jürgen Barth (cyclist) (1943–2011), German cyclist
- Karl Barth (1886–1968), Swiss theologian
- Kaspar von Barth (1587–1658), German writer
- Luis Moglia Barth (1903–1984), Argentine film director
- Mario Barth (born 1972), German comedian
- Markus Barth (1915–1994), Swiss theologian, son of Karl
- Marisa Ferretti Barth (1931–2021), Canadian senator
- Marleen Barth (born 1964), Dutch politician, trade union leader and journalist
- Matthew Barth, American engineer
- Richard Barth (1850–1908), German violinist and composer
- Signe Barth (1895–1982), Swedish painter
- Sonja Barth (1923–2016), Norwegian environmentalist
- Theodor Barth (1849–1909), German politician
- Uta Barth (born 1958), German-American photographer
- Wolf Barth (1942–2016), German mathematician
See also
- Barth, Germany, a town in Mecklenburg-Vorpommern, Germany
- Barth (disambiguation)
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