Kellner is a surname. Notable people with the surname include:
Alex Kellner (1924–1996), baseball pitcherAlexander Kellner (born 1961), Brazilian paleontologistCarl Kellner (optician) (1829–1855), German opticianCarl Kellner (mystic) (1851–1905), Austrian mystic, founder of Ordo Templi OrientisCatherine Kellner (born 1970), American actressDan Kellner (born 1976), American fencer and graphic designerDonald Ferdinand Kellner (1879-1935), Canadian politicianDouglas Kellner (born 1943), American philosopherEsther Kellner (1908 - 1998), American authorFriedrich Kellner (1885–1970), Justice Inspector and Nazi opponentGyula Kellner (1871-1940), Hungarian athleteJamie Kellner, American television executiveJán Kellner, S.J. (1912-1941), Slovak Catholic priest and missionary to USSRJohann Christoph Kellner (1736 – 1803), German composer, son of Johann Peter KellnerJohann Peter Kellner (1705 – 1772), German composer, father of Johann Christoph KellnerLeon Kellner (1859 – 1928), Grammarian, Shakespearean, and ZionistLorenz Kellner (1811-1892), German educatorLarry Kellner (born 1959), American businessmanMicah Kellner (born 1978), American politicianOscar Kellner (1851–1911), German agronomistPaul Kellner (1890 – 1972), German swimmerPeter Kellner (born 1946), British journalistPetr Kellner (born 1964), Czech businessman and wealthiest person in the Czech RepublicRosa Kellner (1910 – 1984), German athleteUwe Kellner, German rowerWalt Kellner (1929 – 2006), American Major League Baseball playerWilliam Kellner (1900 - 1996), British-Austrian art director