Zahn is a German & Ashkenazi Jewish Surname. Notable persons with the surname include:
Ernst Zahn (1867-1952), Swiss writer
Friedrich Wilhelm Zahn (1845-1904), German pathologist
Geoff Zahn (born 1945), American baseball player
Johann Zahn (1631-1707), German canon who wrote on the camera obscura and who invented an early camera
Johannes Zahn (1817-1895), German musicologist and theologian who developed a taxonomy of Lutheran hymns and melodies
Karl Hermann Zahn (1865–1940), German botanist
Wilhelm Zahn (1910-1976) German U-boat commander
Paula Zahn (born 1956), American newscaster
Peter von Zahn, (1913–2001), German author, filmmaker, and journalist
Steve Zahn (born 1967), American actor
Theodor Zahn (1838-1933), German biblical scholar
Timothy Zahn (born 1951), American science fiction novelist
Wilhelm Johann Karl Zahn (1800-1871), German architect, painter and art critic