Harder is a surname. Notable people with the surname include:
(1864–1939), German teacher, nationalistic writer and Nazi propagandist Bobbie Harder, American 21st century politician Christopher Harder (born 1948), Canadian lawyer in New Zealand Conrad Harder (born 2005), Danish footballer Fred Harder (1892–1956), American racing driver Elaine Harder (1947–2013), American politician (1891–1944), German SS-Hauptscharführer in Auschwitz concentration camp George Harder (born 1974), Samoan former rugby union footballer Grace Harder (born 2004), American trampoliner Günter Harder (1938–2025), German mathematician Hans Harder (1792–1873), Danish painter and drawing master Hauke Harder (born 1963), German composer and experimental physicist Heinrich Harder (1858–1935), German artist and art professor Hieronymus Harder (1523–1607), German botanist and teacher of Latin James Harder (ufologist) (1926–2006), American professor of civil and hydraulic engineering, and ufologist Jan Harder (born 1951), Canadian politician Joe Harder (1916–2004), American politician Josh Harder (born 1986), American politician Jürgen Harder (1918–1945), German fighter pilot Kelsie B. Harder (1922–2007), American professor and linguist Knud Harder (1885–1967), Danish composer, organist and conductor Lutz-Michael Harder (1942–2019), German opera tenor and voice teacher Mel Harder (1909–2002), American Major League Baseball pitcher, coach and manager Olli Harder, New Zealand association football coach and former player Otto Harder (1892–1956), German footballer and convicted war criminal Pat Harder (1922–1992), American football player and official Pernille Harder (born 1992), Danish footballer Pernille Harder (badminton) (born 1977), Danish former badminton player Peter Harder (academic) (born 1950), Danish linguist and professor of English Peter Harder (politician) (born 1952), Canadian senator and former civil servant Rachael Thomas (born 1986), née Harder, Canadian politician Rhea Harder (born 1976), German actress Robert Harder (1929–2014), American politician Spud Harder (1906–1994), American college football player, college football and baseball coach and college athletic director Tammo Harder (born 1994), German footballer Theo Härder (born 1945), German computer scientist and professor Vince Harder (born 1982), New Zealand R&B/pop singer and producer
See also Bertus de Harder (1920–1982), Dutch footballer Haeder, surname Hader (disambiguation)#People with the surname Harders, surname