This is a list of notable events, premieres, releases, series cancellations and endings, and other business ventures for Nickelodeon in the year 2003.
Shows
Series premieres
- Original shows
- April 7
- Moose and Zee
- Oobi
- Tweenies
- Miffy
- April 12 - All Grown Up! premieres as the Kids' Choice Awards leadout; though the series would officially premiere in November.
- August 1 - My Life as a Teenage Robot
- August 3 - Degrassi: The Next Generation
- September 13 - Romeo!
- November 9 - Yakkity Yak
- Acquired shows
- March 31 - Wings
- August 10 - Girls v. Boys
- August 17 - Radio Free Roscoe
- August 24 - Real Access
- September 2 - Rubbadubbers
- September 22 - Roseanne
- September 28 - Sabrina, the Teenage Witch
- October 6 - Full House
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 26 - Dora the Explorer season 3
- August 30 - All That season 9
- September 19 - The Adventures of Jimmy Neutron: Boy Genius season 2
Series finales
- February 15 - The Nick Cannon Show
- June 2 - Little Bear
- September 19 - Oswald
Specials
- April 25 - The Adventures of Jimmy Neutron: "The Eggpire Strikes Back"
- August 17 - Nickelodeon Magazine's Big 10 Birthday Bash
- October 13 - The Adventures of Jimmy Neutron: "Operation: Rescue Jet Fusion"
Movies
Theatrical
- June 13 - Rugrats Go Wild!
Made-for-TV
- February 23 - Maniac Magee
- July 12 - The Fairly OddParents: Abra-Catastrophe!
- February 3 - The Electric Piper
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
Albums
- February 4 - ChalkZone: In the Zone
Books
- January
- 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 - A Pickles Passover
- May
- Chasing Dad
- Rugrats Go Wild! (novelization)
- June
- Hands Off!
- The Amazing SpongeBobini
- July
- Goddard, Come Home!
- No More Mr. Smart Guy
- August 1 - Scrambled Planets!
- September
- The Big Halloween Scare
- Canine Catastrophe!
- New Student Starfish
- Rugrats' Favorite Funnies
- Scavenger Hunt
- Special Delivery!
- SpongeBob AirPants: The Lost Episode
- SpongeBob MoviePants
- Token Wishes
- October
- The Big Sweep (Rocket Power Ready-To-Read)
- Christmas in the City
- Fearless
- The Runaway Turkey
- The Science Project
- SpongeBob's Christmas Wish
- November
- Llama Drama
- Sky Scare
- Holly Jolly Jimmy
- December
- December 23
Home video releases
VHS
- January 28
- Rugrats Mysteries
- SpongeBob SquarePants: Bikini Bottom Bash
- SpongeBob SquarePants: Deep Sea Sillies
- February 4
- Blue's Clues: Blue's Big Band
- Dora the Explorer: Map Adventures
- March 4
- Nickelodeon: Nickstravaganza!
- Blue's Clues: 100th Episode Celebration
- SpongeBob SquarePants: Anchors Away
- SpongeBob SquarePants: The Sponge Who Could Fly
- April 1 - The Wild Thornberrys Movie
- May 27
- The Adventures of Jimmy Neutron: Time Warp
- The Adventures of Jimmy Neutron: When Pants Attack
- June 3
- Dora the Explorer: City of Lost Toys
- Blue's Clues: Shapes and Colors
- July 15 - The Fairly OddParents: Abra-Catastrophe!
- July 29
- SpongeBob SquarePants: Laugh Your Pants Off
- SpongeBob SquarePants: Sponge-a-Rama
- August 26
- All Grown Up: Growing Up Changes Everything
- Blue's Clues: Blue Takes You to School
- Dora the Explorer: Rhymes and Riddles
September 2
- Oswald: Best Buddies
- Oswald: Outdoors with Oswald
- September 30
- SpongeBob SquarePants: Christmas
- Blue's Clues: Blue's First Holiday
- October 7
- The Adventures of Jimmy Neutron: Sea of Trouble
- Little Bear: Feel Better Little Bear
- December 16 - Rugrats Go Wild!
DVD
- January 28
- Rugrats Mysteries
- SpongeBob SquarePants: Tales from the Deep
- February 4 - Blue's Clues: Blue's Big Band
- March 4 - SpongeBob SquarePants: Lost at Sea
- April 1 - The Wild Thornberrys Movie
- May 27
- The Adventures of Jimmy Neutron: Confusion Fusion
- Harriet the Spy
- Good Burger
- June 3
- Dora the Explorer: City of Lost Toys
- Blue's Clues: Shapes and Colors
- July 15 - The Fairly OddParents: Abra-Catastrophe!
- July 29 - SpongeBob SquarePants: Tide and Seek
- August 26
- All Grown Up: Growing Up Changes Everything
- NickToons Halloween
- Blue's Clues: Blue Takes You to School
- Dora the Explorer: Rhymes and Riddles
- September 15 - The Best of Ren & Stimpy
- September 30
- NickToons Christmas
- SpongeBob SquarePants: Christmas
- Blue's Clues: Blue's First Holiday
- October 7 - The Adventures of Jimmy Neutron: Sea of Trouble
- October 28 - SpongeBob SquarePants: The Complete 1st Season
- December 16 - Rugrats Go Wild!
Events
- April 11 - Jimmy Neutron's Nicktoon Blast opens at Universal Studios Florida.
Character debuts
- Dora the Explorer - Diego and Baby Jaguar
- Moose A. Moose and Zee
- My Life As A Teenage Robot: Jenny Wakeman, Nora Wakeman, Brad Carbunkle, Tuck Carbunkle, Sheldon Lee, Vexus, Brit and Tiff Crust, XJs 1-8
People
- April 19 - Caleel Harris is born
- May 1 - Lizzy Greene is born
- May 19 - JoJo Siwa is born
- June 11 - Breanna Yde is born
- June 30 - Buddy Hackett dies
- August 18 - Max Charles is born
- September 18 - Aidan Gallagher is born
- November 12 - Kamaia Fairburn is born
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