Hahn is a German surname. Notable people with the surname include:
Alfred Hahn (1890–1964), architect in Toledo, Ohio, USA
Archie Hahn (1880–1955), American sprinter
August Hahn (1792–1863), German Protestant theologian
Bernard Hahn (1860-1931), American politician
Billy Hahn (born 1955), American basketball coach
Carl Hugo Hahn (1818–1895), German missionary in Namibia
Carl Wilhelm Hahn (1786–1835), German zoologist
Joe Hahn (born 1977), DJ of Linkin Park
Johannes Hahn (born 1957), Austrian politician
Dave Hahn (born 1959), guitarist, singer/songwriter
David Hahn, the "Radioactive Boy Scout"
David Hahn (Nebraska), 2006 Democratic candidate for Governor of Nebraska
David Hahn (cartoonist), cartoonist
Dirk Meinerts Hahn (1804–1860), German captain
Edith Hahn Beer (1914–2009), Jewish Holocaust survivor
Erwin Hahn (1921–2016), U.S. physicist, best known for his work on nuclear magnetic resonance (NMR)
Frank Hahn (1925–2013), Cambridge economist
Hans Hahn (mathematician) (1879–1934), Austrian mathematician
Hans "Assi" Hahn, (1914-1982), German World War II fighter ace
Hilary Hahn (born 1979), violinist
James K. Hahn (born 1950), politician, 40th Mayor of Los Angeles, California
Janice Hahn, politician, member of the Los Angeles City Council
Jerri Ariel Farias Hahn, Brazilian footballer
Jessica Hahn (born 1959), celebrity, nude model, and church secretary
Jody Margolin Hahn, American television director
Jörg-Uwe Hahn (born 1956), politician
Kathryn Hahn (born 1974), actress
Kenneth Hahn (1920–1997), politician, member of the Los Angeles County Board of Supervisors
Kimberly Hahn (born 1957), Catholic author and apologist
Kurt Hahn (1886–1974), German teacher and education reformer
Lloyd Hahn (1898–1983), American middle-distance runner
Martin Hahn (born 1964), Venezuelan telenovelas writer
Otto Hahn (1879–1968), German nuclear chemist, discoverer of nuclear fission, Nobel Prize winner (Chemistry 1944), founder of the Max-Planck-Society, peace activist
Philipp Matthäus Hahn (1739–1790), German priest and inventor
Reynaldo Hahn (1874–1947), Venezuelan composer and lover of Marcel Proust
Scott Hahn (born 1957), Catholic writer and apologist
William Hahn (1829–1887), German painter
William John Hahn (1841–1902), Minnesota Attorney General
Wolfgang Hahn (1911–1998), German mathematician
