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)