Portal:Cartoon Network/Selected anniversaries/January
- January 1, 2018 – Unikitty! debuts on Cartoon Network
- January 4, 1999 – Ed, Edd n Eddy debuts on Cartoon Network (1999-2009)
- January 8, 1997 – O Canada, a Canadian-American animated television anthology series debuts on Cartoon Network (1997-2002)
- January 14, 2009 – Cartoon Network Universe: FusionFall, a massively multiplayer online game developed by Cartoon Network and Grigon Entertainment is released
- January 24, 2013 – Incredible Crew, a sketch comedy television series debuts on Cartoon Network (2013)
Portal:Cartoon Network/Selected anniversaries/February
- February 16, 2003 – The Venture Bros. debuts as a pilot on Cartoon Network's Adult Swim block
- February 18, 2007 – Camp Lazlo: Where's Lazlo?, a television film of Camp Lazlo airs on Cartoon Network
- February 20, 1995 – What a Cartoon!, animation showcase project debuts on Cartoon Network (1995-2001)
- February 20, 2005 – Robot Chicken, a stop motion television series debuts on Cartoon Network's Adult Swim block (2005-Present)
Portal:Cartoon Network/Selected anniversaries/March
- March 2, 2000 – I Am Weasel finishes airing on Cartoon Network
- March 17, 1997 – Toonami debuts on Cartoon Network
- March 23, 2012 – Ben 10: Destroy All Aliens, a computer-animated science fiction action film premieres
- March 25, 2005 – The Powerpuff Girls finishes airing on Cartoon Network
- March 30, 2007 – Billy & Mandy's Big Boogey Adventure, a television film of The Grim Adventures of Billy & Mandy airs
Portal:Cartoon Network/Selected anniversaries/April
- April 1, 2000 – A sister channel of Cartoon Network, Boomerang (secondary logo pictured) launches.
- April 5, 2010 – Adventure Time, created by Pendleton Ward premieres on Cartoon Network based on the animated short (2010-2018)
- April 13, 2007 – Aqua Teen Hunger Force Colon Movie Film for Theaters, a semi-canonical comedy film based on the Adult Swim animated series Aqua Teen Hunger Force was released
- April 15, 1994 – Space Ghost Coast to Coast premieres on Cartoon Network (1994–2004)
- April 27, 1996 – Dexter's Laboratory, created by Genndy Tartakovsky debuts on Cartoon Network (1996–2003)
Portal:Cartoon Network/Selected anniversaries/May
- May 1, 2004 – Megas XLR debuts on Cartoon Network (2004-2005)
- May 3, 2009 – Foster's Home for Imaginary Friends finishes airing on Cartoon Network
- May 3, 2011 – The Amazing World of Gumball debuts on Cartoon Network (2011-present)
- May 10, 2009 – Snake 'n' Bacon an animated television pilot airs on Cartoon Network's Adult Swim block
- May 30, 2005 – The Life and Times of Juniper Lee debuts on Cartoon Network (2005-2007)
Portal:Cartoon Network/Selected anniversaries/June
- June 5, 2008 – The Marvelous Misadventures of Flapjack airs on Cartoon Network (2008-2010)
- June 8, 2001 – Time Squad airs on Cartoon Network (2001-2003)
- June 13, 2003 – The Grim Adventures of Billy & Mandy airs on Cartoon Network (2003-2007)
- June 25, 2002 – Whatever Happened to... Robot Jones? airs on Cartoon Network (2002-2003)
Portal:Cartoon Network/Selected anniversaries/July
- July 3, 2002 – The Powerpuff Girls Movie, a film based on the Cartoon Network animated television series of the same name was released in theaters.
- July 8, 2005 – Camp Lazlo premieres on Cartoon Network (2005–2008).
- July 11, 2003 – Evil Con Carne premieres on Cartoon Network (2003-2004).
- July 14, 1997 – Johnny Bravo premieres on Cartoon Network (1997–2004).
- July 15, 1997 – Cow and Chicken premieres on Cartoon Network (1997–1999).
- July 15, 1997 – I Am Weasel premieres on Cartoon Network (1997–2000).
- July 17, 1997 – Cartoon Cartoons, an television block premieres (logo pictured) on Cartoon Network (1997–2003).
Portal:Cartoon Network/Selected anniversaries/August
- August 6, 2006 – Metalocalypse, created by Brendon Small and Tommy Blacha debuts on Cartoon Network's Adult Swim block
- August 10, 2001 – Samurai Jack, created by Genndy Tartakovsky debuts on Cartoon Network (2001-2004)
- August 13, 2004 – Foster's Home for Imaginary Friends, created by Craig McCracken (pictured) debuts on Cartoon Network (2004-2009)
- August 24, 2001 – Grim & Evil, created by Maxwell Atoms debuts on Cartoon Network (2001-2002)
Portal:Cartoon Network/Selected anniversaries/September
- September 2, 2001 – Adult Swim (logo pictured), a programming block from its Turner sister cable channel Cartoon Network, is initiated.
- September 2, 2001 – The Brak Show (2001-2003), Harvey Birdman, Attorney at Law (2001-2007) and Sealab 2021 (2001-2005) debuts on Cartoon Network's Adult Swim block
- September 6, 2010 – Regular Show, created by J. G. Quintel debuts on Cartoon Network (2010-2017)
- September 9, 2001 – Aqua Teen Hunger Force debuts on Cartoon Network's Adult Swim block (2001-2015)
- September 14, 2007 – Out of Jimmy's Head, a live-action/animated television series debuts on Cartoon Network (2007-2008)
- September 17, 2010 – Sym-Bionic Titan, created by Genndy Tartakovsky debuts on Cartoon Network (2010-2011)
Portal:Cartoon Network/Selected anniversaries/October
- October 1, 1992 – Cartoon Network (original logo pictured) begins broadcasting by Turner Broadcasting System with the Merrie Melodies short Rhapsody Rabbit
- October 3, 2008 – Star Wars: The Clone Wars debuts on Cartoon Network (2008-2013)
- October 3, 2008 – The Secret Saturdays debuts on Cartoon Network (2008-2010)
- October 12, 2008 – Underfist: Halloween Bash, a spinoff special of The Grim Adventures of Billy & Mandy airs on Cartoon Network
Portal:Cartoon Network/Selected anniversaries/November
- November 2, 2007 – Chowder debuts on Cartoon Network (2007-2010)
- November 7, 2003 – Star Wars: Clone Wars, created by Genndy Tartakovsky based on the Star Wars franchise airs on Cartoon Network (2003-2005)
- November 8, 2009 – Ed, Edd n Eddy's Big Picture Show, a series finale of the television film of Ed, Edd n Eddy airs
- November 12, 1999 – Courage the Cowardly Dog premieres on Cartoon Network (1999-2002)
- November 12, 1999 – Mike, Lu and Og premieres on Cartoon Network (1999-2001)
- November 18, 1998 – The Powerpuff Girls (logo pictured) debuts on Cartoon Network (1998-2005)
Portal:Cartoon Network/Selected anniversaries/December
- December 5, 1993 – The Moxy Pirate Show, later to be known as The Moxy Show premieres on Cartoon Network (1993–2000).
- December 6, 2002 – Codename: Kids Next Door debuts on Cartoon Network (2002–2008)
- December 10, 1999 – Dexter's Laboratory: Ego Trip, a special airs on Cartoon Network
- December 26, 2005 – My Gym Partner's a Monkey debuts on Cartoon Network (2005–2008)
- December 27, 2007 – Transformers Animated debuts on Cartoon Network (2007–2009)
- December 27, 2005 – Ben 10 debuts on Cartoon Network (2005–2008)