Harrer is a German surname. Notable people with the surname include:
Alois Harrer (born 1926), West German cross-country skier
Corinna Harrer (born 1991), German middle-distance runner
David Harrer (born 1990), Austrian footballer
Heinrich Harrer (1912–2006), Austrian mountaineer, sportsman, geographer, and writer
Johann Gottlob Harrer (1703–1755), German composer
Karl Harrer (1890–1926), German journalist and politician
Viona Harrer (born 1986), German ice hockey player