Stephen Andrew Baldwin (born May 12, 1966) is an American actor and the youngest of the Baldwin brothers.

Baldwin was born in Massapequa, New York, the son of Carol Newcomb (née Martineau), a breast cancer survivor who founded the Carol M. Baldwin Breast Care Center of the University Hospital and Medical Center at Stony Brook, and Alexander Rae Baldwin, Jr., a high school history and social studies teacher and a football coach. Stephen Baldwin is the brother of notable actors, Alec, Daniel and William, sometimes collectively known as the "Baldwin brothers." Baldwin was raised in a Roman Catholic family and is of Irish, English and French descent.

During his time at Berner High School, Baldwin was a successful opera singer. After high school, he attended the American Academy of Dramatic Arts for one year, in a two year program, but, was kicked out because of his personal escapades. He played small roles in shows like Kate and Allie, "America's Most Wanted" and Family Ties, before landing his first adult feature film role, in the 1988 film The Beast. That role led to other parts, in the 1989 films Last Exit to Brooklyn and Born on the Fourth of July, as well as the television series The Young Riders. In 1995 he landed a breakthrough role in The Usual Suspects. Baldwin's next role was in Bio-Dome, in 1996.