Newnes is a surname. Notable people with the surname include:
Billy Newnes (born 1959), British jockey David Newnes, Australian lawyer and judge Frank Newnes (1876–1955), British publisher and businessman George Newnes (1851–1910), British publisher Jack Newnes (1895–1969), Welsh football player Jack Newnes (Australian footballer) (born 1993), Australian rules football player
See also Newnes (disambiguation)