Hirth is a surname. Notable people with this surname include:
Friedrich Hirth Ph.D. (1845–1927), German-American sinologist
Georg Hirth (1841–1916), German writer, journalist and publisher
Hellmuth Hirth (1886–1938), German engineer who, founded the Mahle GmbH and Hirth companies
John Joseph Hirth (1854–1931), Catholic Bishop in German East Africa, founder of the church in Rwanda
Wolf Hirth (1900–1959), German gliding pioneer and sailplane designer
