John Francis Daley (born July 20, 1985; Wheeling) is an American screenwriter, director, actor and musician. He is best known for playing high school freshman Sam Weir on the NBC comedy-drama Freaks and Geeks and FBI criminal profiler Dr. Lance Sweets on the crime drama series Bones, for which he was nominated for a 2014 PRISM Award. He plays keyboards and sings for the band Dayplayer.

Daley is also best known for his collaborative work with fellow writer and director Jonathan Goldstein, working on various films together. Daley and Goldstein's first work together was co-writing the comedy Horrible Bosses (2011), co-writers for The Incredible Burt Wonderstone (2013), co-story writing for Horrible Bosses 2 (2014), and co-writing/co-directing (in their directing debuts) the fifth film in the National Lampoon's Vacation film series, Vacation (2015). The duo were co-writers for Spider-Man: Homecoming (2017) with Jon Watts, Christopher Ford, Chris McKenna and Erik Sommers, and they co-directed the 2018 comedy Game Night.