William Thomas "Bill" Hader Jr. (born June 7, 1978) is an American actor, comedian, director, producer and writer.

He is best known for his roles in Saturday Night Live, Barry, Cloudy with a Chance of Meatballs, Superbad, Hot Rod, Tropic Thunder, Adventureland, Paul, Forgetting Sarah Marshall, Night at the Museum: Battle of the Smithsonian, Inside Out, Star Wars: The Force Awakens, The BFG and as adult Richie Tozier in It – Chapter Two.

He married Maggie Carey in 2006 and they had 3 children. Hader and Carey separated in 2017 and Hader later filed for divorce several months later in December 2017. The divorce was finalized in 2018.