The Tonight Show is a US late-night talk show that has aired on NBC since 1954. It is the longest currently running regularly scheduled entertainment program in the US and the third longest-running show on NBC after Meet the Press and Today.
The Tonight Show was hosted by Steve Allen (1954"1957), Jack Paar (1957"1962), Johnny Carson (1962"1992), Jay Leno (1992"2009, 2010"present), and Conan O'Brien (2009"2010). Several guest hosts also appeared, particularly during the Paar and Carson eras.