Steven Robert Guttenberg (born August 24, 1958) is an American actor, author, businessman, producer, and director. He is known for his lead roles in Hollywood films of the 1980s and 1990s, including Cocoon, Police Academy, Three Men and a Baby, Three Men and a Little Lady, Diner, The Bedroom Window, The Big Green, and Short Circuit.

While still in high school, he attended a summer program at the Juilliard School and studied under John Houseman. After graduating from high school, he moved to Los Angeles to pursue a career in acting. He made his film debut in 1978 in the drama The Boys from Brazil. His breakthrough role came in 1980, when he starred in the comedy Diner. He then went on to star in a string of successful films, including Cocoon, Police Academy, Three Men and a Baby, and Short Circuit.

In the 1990s, his career slowed down, but he continued to work steadily in film and television. He has appeared in such films as The Lost World: Jurassic Park, The Day After, and Ballers. He has also had recurring roles on the television series Veronica Mars, Law & Order: Criminal Intent, and The Goldbergs.

In addition to his acting career, he is also a businessman and producer. He is the co-founder of the production company Guttenflick Pictures. He is also the author of two books, The Guttenberg Bible and The Kids from DISCO.

Guttenberg is married to WCBS-TV reporter Emily Smith. They have been together since 2014 and were married in 2019.