Sean Patrick Astin, born on February 25, 1971, in Santa Monica, California, is an acclaimed American actor whose career spans several decades, marked by significant contributions to both film and television. He is particularly celebrated for his role as Mikey Walsh in the beloved adventure film The Goonies (1985), which became a cult classic and established him as a charming young star. Astin's lineage is compelling; he is the son of the acclaimed actress Patty Duke and was adopted by her then-husband, actor John Astin, in 1972.

Astin's early life was steeped in the entertainment industry, which paved the way for his career as a child actor. He made a notable impact with his performance in The Goonies, which opened doors for a variety of roles in the 1990s. He starred as Billy Tepper in Toy Soldiers (1991) and played Dave Morgan in Encino Man (1992). However, it was his portrayal of Daniel Ruettiger in Rudy (1993) that further solidified his reputation as a talented leading man, earning him critical acclaim and a devoted fanbase.

Astin's career reached new heights with his iconic role as Samwise Gamgee in The Lord of the Rings trilogy, directed by Peter Jackson. The films, released between 2001 and 2003, showcased Astin's ability to convey deep emotional resonance, earning him recognition as a beloved character in one of the most successful franchises in cinematic history. His performance as Sam, a loyal companion to Elijah Wood's Frodo Baggins, captured the hearts of audiences and critics alike.

In addition to his film work, Astin has made significant contributions to television. He portrayed Lynn McGill in the fifth season of the acclaimed series 24 (2006), lent his voice to the character Oso in the children's animated series Special Agent Oso (2009–2012), and voiced Raphael in the reboot of Teenage Mutant Ninja Turtles (2012–2017). More recently, he captivated audiences as Bob Newby in the popular Netflix series Stranger Things (2017), showcasing his versatility as an actor.

Throughout his career, Astin has received numerous accolades, including a Screen Actors Guild Award and two Young Artist Awards. He was also nominated for an Academy Award for Best Live Action Short Film in 1994 for his work on the short film Kangaroo Court. His dedication to the craft extends beyond acting; he has taken on leadership roles within the industry, including serving as the 4th national president of SAG-AFTRA, a position he was elected to in 2025.

Astin has been married to Christine Astin since July 11, 1992, and they have three daughters together. With a career that reflects both talent and passion, Sean Astin continues to be a prominent figure in the entertainment world, celebrated for both his artistic achievements and his advocacy for the rights of performers.