Leth is a Danish surname. Notable people with the surname include:
Harald Leth (1899–1986), Danish painter Jan Leth (1932–2010), Danish artist Jørgen Leth (1937–2025), Danish poet and film director, father of Karoline Leth Julie Norman Leth (born 1992), Danish racing cyclist Karl Leth (born 2002), Danish footballer Karoline Leth (born 1964), Danish film and TV producer, daughter of Jørgen Leth Kate Leth (born 1988), Canadian comic book creator Lasse Norman Leth (born 1992), Danish road and track racing cyclist Marie Gudme Leth (1895–1997), Danish textile printer Märtha Leth (1877–1954), Swedish pharmacist, first woman in Sweden to graduate as a pharmacist Vera Leth (born 1958), Greenlandic ombudsman
See also Lethe (disambiguation) Lethings, a dynasty of Lombard kings in the 5th and 6th centuries