Helin is a surname. Notable people with the surname include:
Charles Helin, American inventor
Anne Helin, Finnish ice hockey player
Bill Helin, Canadian artist
Calvin Helin, Canadian writer
Eleanor F. Helin, American astronomer
Johann Hélin, alternative spelling of Johann Heynlin (c. 1425–1496), a German born French scholar
Mika Helin (born 1978), Finnish footballer
Pekka Helin, architect who designed Pikkuparlamentti
Sofia Helin (born 1972), Swedish actress
Toomas Helin (born 1966), Estonian drug smuggler
Topi Helin (born 1978), Finnish Thaiboxer
Ville Helin, author of Wzonka-Lad