John Francis Daley (born July 20, 1985) is an American filmmaker and actor. 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 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-writing 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 and the 2023 fantasy Dungeons & Dragons: Honour Among Thieves.