Munn as a surname may refer to:
- Allison Munn (born 1974), American actress
- Clarence Munn (1908–1975), college football player and coach
- Geoffrey Munn (born 1953), jewellery expert on the BBC's Antiques Roadshow
- Gurnee Munn (died 1960), American businessman
- Jack Munn, Australian rugby player
- John Munn (disambiguation), several people
- Kathleen Munn (1887–1974), Canadian artist
- Louise Munn (born 1983), Scottish hockey player
- Mancel Thornton Munn (1887–1956), American agronomist and botanist
- Mark Munn (born 1953), American ancient historian
- Meg Munn (born 1959), British politician
- Olivia Munn (born 1980), American actress and TV personality
- Orson Desaix Munn, (1824-1907), publisher of Scientific American
- Robert Stewart Munn (1829–1894), Newfoundland merchant and politician
- Robert Edward Munn (1919–2013), Canadian climatologist and meteorologist
- H. Warner Munn (1903–1981), American writer
Munn may also refer to:
- Munn Run, a stream in Ohio