James Thomas Fallon (born September 19, 1974) is an American television host, comedian, and actor. He is known for his work in television as a cast member on Saturday Night Live and as the host of the late-night talk show The Tonight Show Starring Jimmy Fallon, which he began hosting after Late Night with Jimmy Fallon ended.

Fallon grew up with an interest in comedy and music, moving to Los Angeles at 21 to pursue stand-up comedy. He was commissioned to join Saturday Night Live as a cast member in 1998, fulfilling a lifelong dream. He remained on SNL for six years between 1998 and 2004, co-hosting the program's Weekend Update segment and becoming well known in the process. He left the show to star in films such as Taxi (2004) and Fever Pitch (2005).

Following his film career, Fallon returned to television as the host of Late Night with Jimmy Fallon on NBC in 2009, where he became known for his emphasis on music and video games. He moved from that show to become the sixth permanent host of the long-running Tonight Show in 2014. In addition to his television work, he has released two comedy albums and seven books, mainly aimed at children.