Riegel is a German surname. Notable people with the surname include:
Anton Pius Riegel (1789–?), Austrian architectBill Reigel (1932-1993) American basketball player and coachE.C. Riegel (1879–1953), independent scholar, author and consumer advocateEden Riegel (born 1981), American actressFranz Riegel (1843–1904), German internist and gastroenterologistHans Riegel (1923–2013), German entrepreneurHans Riegel, Sr. (1893-1945), German entrepreneurSam Riegel (born 1976), American voice actor, writer and directorSkee Riegel (1914–2009), American golferTatiana S. Riegel, American film editor