Riehl is a German surname. Notable people with the surname include:
Alois Riehl (1844–1924), Austrian philosopher Emily Riehl, American mathematician Herbert Riehl (1915-1997), German-born American meteorologist Kevin Riehl (born 1971), Canadian professional ice hockey player Nikolaus Riehl (1901–1990), German nuclear chemist Walter Riehl (1881–1955), Austrian lawyer and politician Wilhelm Heinrich Riehl (1823–1897), German journalist, novelist and folklorist