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
Portal:Cartoon Network/Selected anniversaries/March
Portal:Cartoon Network/Selected anniversaries/April
Portal:Cartoon Network/Selected anniversaries/May
Portal:Cartoon Network/Selected anniversaries/June
Portal:Cartoon Network/Selected anniversaries/July
Portal:Cartoon Network/Selected anniversaries/August
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
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