Knorr is a surname. Notable people with the surname include:
Brian Knorr (born 1963), football coachCarl Heinrich Theodor Knorr (1800-1875), German businessman and founder of the company Knorr.Christian Knorr von Rosenroth (1636–1689), Christian HebraistEduard von Knorr (1840–1920), German admiralFred Knorr (died 1960), American radio executiveGeorg Knorr (1859–1911), engineer and entrepreneur in railroad technologyGeorg Wolfgang Knorr (1705-1761) German natural history illustrator from NürnbergIwan Knorr (1853–1916), German teacher of musicJohnny Knorr, American musician and big band leaderKaren Knorr, American photographerKarin Knorr Cetina (born 1944), Austrian sociologistLudwig Knorr (1859–1921), German chemistMartin J. Knorr (1906–1989), New York politicianMicah Knorr (born 1975), NFL football playerNathan Homer Knorr (1905–1977), third president of the Watchtower Bible and Tract SocietyRandy Knorr (born 1968), American baseball playerTheresa Knorr (born 1946), American woman who murdered two childrenWilbur Knorr (1945–1997), American historian of mathematics and a professor