This is a list of notable events, premieres, releases, series cancellations and endings on Nickelodeon in the year 2003.
Shows
Series premieres
- April 12 - All Grown Up! premieres as the Kids' Choice Awards leadout; the series would officially premiere in November.
- August 1 - My Life as a Teenage Robot
- September 13 - Romeo!
Season premieres
- February 3 - The Wild Thornberrys season 5 (final)
- May 30 - ChalkZone season 2
- August 9 - As Told by Ginger season 3 (final)
- August 30 - All That season 9
- September 19 - The Adventures of Jimmy Neutron: Boy Genius season 2
Specials
- The Adventures of Jimmy Neutron: Boy Genius: "The Eggpire Strikes Back"
- October - The Adventures of Jimmy Neutron: "Rescue Jet Fusion"
Movies
Theatrical
Made-for-TV
- Maniac Magee
- July 12 - The Fairly OddParents: Abra-Catastrophe!
Comics
- The Rugrats comic strip is cancelled
Video games
- November 3 - The Fairly OddParents: Breakin' Da Rules
- November 10 - SpongeBob SquarePants: Battle for Bikini Bottom
Books
- Ding Dong
- Llama Drama
- The Science Project
- Sky Scare
- Token Wishes
- January 1
- Battle of the Band
- Chew on This!
- Genius 101 : Exploring My World
- Jimmy on Ice
- SpongeBob JokePants
- The Time Pincher
- A Valentine for Tommy
- February 1 - A Pickles Passover
- May 1
- Chasing Dad
- Rugrats Go Wild! (novelization)
- June 1
- Hands Off!
- The Amazing SpongeBobini
- July 1
- Goddard, Come Home!
- No More Mr. Smart Guy
- August 1 - Scrambled Planets!
- September 1
- The Big Halloween Scare
- Canine Catastrophe!
- New Student Starfish
- Rugrats' Favorite Funnies
- Scavenger Hunt (Rocket Power)
- Special Delivery! (SpongeBob SquarePants book)
- SpongeBob AirPants: The Lost Episode
- October 1
- The Big Sweep (Rocket Power Ready-To-Read)
- Christmas in the City
- The Runaway Turkey
- SpongeBob's Christmas Wish
- November 3
- Holly Jolly Jimmy
- December 23
Home video releases
- January 28 - SpongeBob SquarePants: Tales from the Deep
- March 4 - SpongeBob SquarePants: Lost at Sea
- May - The Adventures of Jimmy Neutron: Confusion Fusion
- May 27 - Harriet the Spy and Good Burger are released on DVD
- July 15 - The Fairly OddParents: Abra-Catastrophe!
- July 29 - SpongeBob SquarePants: Tide and Seek
- August 26 - NickToons Halloween
- September 30
- NickToons Christmas
- SpongeBob SquarePants: Christmas
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