Ringer is a surname. Notable people with the surname include:
Entrepreneurs Frederick Ringer (1838–1907), British merchant Robert Ringer (born 1938), American entrepreneur
Performers Catherine Ringer (born 1957), French singer-songwriter Jenifer Ringer, American ballet dancer and teacher Noah Ringer (born 1996), American actor
Sportspeople Antony Ringer (born 1966), British sport shooter Derek Ringer (born 1956), Scottish rally co-driver Jamie Ringer (born 1976), Welsh rugby player Javon Ringer (born 1987), Michigan State University running back Joel Bennett Ringer (born 1996), Welsh rugby player Paul Ringer (born 1948), Welsh rugby player Richard Ringer (born 1989), German runner Thomas Ringer (1883–1969), British boxer
Writers Armand T. Ringer, a pseudonym used by American writer Martin Gardner Mark Ringer (born 1959), American writer and theatre director
Others Barbara Ringer (1925–2009), American civil servant Carolyn Ringer Lepre, American academic administrator Herb Ringer (1913–1998), American photographer Sydney Ringer (1836–1910), British clinician and pharmacologist, best known for inventing Lactated Ringer's solution