Gary Alan Sinise (born March 17, 1955) is an American actor, film director, philanthropist, and musician. Among other awards, he has received an Emmy Award, a Golden Globe, a Tony, and four Screen Actors Guild Awards. He has also been honored with a star on the Hollywood Walk of Fame and was nominated for an Academy Award.

He has also received numerous awards and honors for his extensive humanitarian work and involvement with charitable organizations. He supports various veterans' organizations and founded the Lt. Dan Band (named after his character in Forrest Gump), which performs at military bases around the world.

His acting career began on stage with the Steppenwolf Theatre Company in 1983, when he directed and starred in a production of Sam Shepard's True West, for which he received an Obie Award. He later received four Tony Award nominations, including for roles in The Grapes of Wrath and One Flew Over the Cuckoo's Nest. He received a Tony Award for Regional Theatre along with the Steppenwolf Theatre Company.

He first appeared on screen in the adaptation of John Steinbeck's classic novel Of Mice and Men, which he also directed and produced. Sinise played George Milton alongside John Malkovich as Lennie.