2003

This is a list of notable events, premieres, releases, series cancellations, and endings in the year 2003.

Television

 * January 6 - The Berenstain Bears premiered on PBS Kids.
 * January 7 - Little Robots premiered on TLC.
 * February 8 - Teenage Mutant Ninja Turtles (2003 TV series) premiered on 4Kids.
 * April 12 - All Grown Up! premiered on Nickelodeon.
 * July 19 - Teen Titans premiered on Cartoon Network.
 * August 1 - My Life as a Teenage Robot premiered on Nickelodeon.
 * September 7 - Jakers! The Adventures of Piggley Winks premiered on PBS Kids.
 * September 20 - Lilo & Stitch: The Series premiered on Disney Channel.
 * September 20 - Clifford's Puppy Days premiered on PBS Kids.
 * September 28 - JoJo's Circus premiered on Playhouse Disney.
 * November 7 - Star Wars: Clone Wars premiered on Cartoon Network.
 * December 1 - Poko  premiered on TLC.

Films

 * February 14 - The Jungle Book 2 (Walt Disney Pictures)
 * March 21 -    Piglet's Big Movie (Walt Disney Pictures)
 * May 30 - Finding Nemo (Disney/Pixar)
 * June 13 - Rugrats Go Wild! (Paramount/Nickelodeon)
 * November 1 - Brother Bear (Walt Disney Pictures)
 * November 14 -  Looney Tunes: Back in Action (Warner Bros.)