Thomas Patrick Lennon (born August 9, 1970) is an American actor, comedian, screenwriter, director and producer, best known as a cast member of the MTV show "The State" and for his role as Lieutenant Jim Dangle in the Comedy Central series "Reno 911!", as well as for his role as Andrew Novak in the series "Santa Clarita Diet" and Felix Unger in the series "The Odd Couple". He is the screenwriter of several comedies released by major film studios, co-written with Robert Ben Garant. They wrote the films "Night at the Museum", "Kindergarten Cop", "Balls of Fury" and "Baywatch".

Lennon was born on August 9, 1970 in Oak Park, Illinois. Of Irish and Scottish descent, he is the son of Kathleen (née McSheehy) and Timothy Lennon. He graduated from Oak Park and River Forest High School in 1988.

At age 16, he met his girlfriend and future co-star Kerri Kenney at a theater camp at Northwestern University. They later studied at New York University, where they joined a comedy troupe called The New Group.