Original Run (1954-1967):
* Steve Allen (1954-1957)
* Jack Paar (1957-1962)
* Johnny Carson (1962-1992)
Current Run (1992-present):
* Jay Leno (1992-1993, 1995-2009, 2010-2014)
* Conan O'Brien (1993-1995, 2009-2010)
* Jimmy Fallon (2014-present)
Other Notable Hosts:
* Arnold Stang (briefly filled in for Jack Paar in 1958)
* Hugh Downs (hosted the Friday night edition of The Tonight Show in 1967)
* David Letterman (hosted a special edition of The Tonight Show in 1978)
It's worth noting:
* Steve Allen was the very first host of The Tonight Show.
* Johnny Carson is widely considered the most iconic host, holding the position for 30 years.
* Jay Leno hosted the show for a total of 22 years, split into two stints.
* The Tonight Show has had several different names throughout its history, including The Tonight Show Starring Johnny Carson, The Tonight Show with Jay Leno, and The Tonight Show Starring Jimmy Fallon.