Gaertner or Gärtner is a German surname meaning "gardener". Notable people with the surname include:
Karl Friedrich von Gaertner (1772–1850), German botanist known as "C.F.Gaertn." or "Gaertner fils"Christian Gärtner (1705–1782), German merchant and astronomer, after whom is named:Gärtner (crater), a crater on the Moon132445 Gaertner, an asteroidJoseph Gaertner (1732–1791), German botanist known as "Gaertn."Friedrich von Gärtner (1791–1847), German architectGottfried Gaertner (1754–1825), German botanist known as "G. Gaertn."Friedrich Gärtner (1824–1905), German architectural painterGustav Gärtner (1855–1937), Austrian pathologistCarl Gaertner (1898–1952), U.S. artistBelva Gaertner (1885–1965), U.S. cabaret singer and alleged murdererGeorg Gärtner (1920–2013), German soldierHildesuse Gärtner (born 1923), German alpine skierBertil Gärtner (1924–2009), Swedish Lutheran bishop of GothenburgClaus Theo Gärtner (born 1943), German television actor