Scott Vincent James Baio (pronounced /ˈbeɪ.oʊ/; born September 22, 1961) is an American actor, best known for his work on the sitcoms Happy Days, Joanie Loves Chachi, and Charles in Charge. He recently appeared in his own VH1 reality series titled Scott Baio Is 45...and Single followed by Scott Baio Is 46...and Pregnant.

Baio was born in Brooklyn, New York, the son of Rose and Mario Baio, a personal manager. His grandparents were immigrants from Italy. He attended Xaverian High School, and later graduated from North Hollywood High School. His siblings as well as their cousin, Jimmy Baio, are also actors.

In 1976, Baio played the title character Bugsy Malone in the cult kiddie gangster musical directed by Alan Parker, which also co-starred Jodie Foster. Baio and Foster later worked together again in the 1980 teen girl drama Foxes helmed by Adrian Lyne. When he was 16, Baio was then cast as The Fonz's cousin, Chachi Arcola, on Happy Days. During his Happy Days run, Baio earned two Emmy Award nominations for his lead performances in the TV movies Stoned (1981) and All The Kids Do It (1985). He also won two Young Artists Awards during the Third Annual Youth in Film Awards (1980-1981) as Best Young Actor in a Television Special for Stoned and Best Young Comedian in Television or Motion Pictures for Happy Days. He also starred in the made-for-television youth drama specials The Boy Who Drank Too Much with Lance Kerwin and Senior Trip with Mickey Rooney.