John Francis Daley is an American television and film actor and director. He is best known for his portrayal of Sam Weir on the short-lived NBC comedy-drama Freaks and Geeks. Daley was the actual age of a high school freshman when he played Weir.

Daley has been acting since age nine, when he was cast as "Young Tommy" in the U.S. and international tours of the Broadway hit The Who's Tommy. Since then, Daley has worked continuously in television, including series such as The Geena DavisShow, Boston Public, Regular Joe, Kitchen Confidential, Judging Amy, and Spin City. Daley's film credits include Waiting. He also wrote and starred in the comedy short Friday Night, and played the lead in the independent film 5-25-77.

Daley was born in Wheeling, Illinois to R.F. Daley, an actor, and Nancy Daley, a piano teacher. He has appeared in multiple productions with his father. Daley holds a black belt in Kung Fu.

In 2001, Daley directed a short film titled What Babies Do. In 2005, he appeared in the Fox sitcom Kitchen Confidential. He was also featured in the film Waiting.... In 2007, Daley joined the cast of the Fox drama series Bones.

Daley is the keyboardist in a band called Dayplayer.