| Title | Seasons | Episodes | Country | Year | Original Channel | Technique |
|---|
| Adventures of Chhota Birbal | 1 | | India | 2003 [1] | Cartoon Network | Traditional |
| The Adventures of Tenali Raman | 1 | 26 | India | 2003 | Cartoon Network | Traditional |
| Albert Asks... What is Life? | 1 | 26 | Germany | 2003 [2] | KI.KA | Traditional |
| All Grown Up! | 5 | 55 | United States | 2003–08 | Nickelodeon | Traditional |
| Antje | 1 | 26 | Germany | 2003 [3] | Das Erste | Traditional |
| The Aquaman & Friends Action Hour | 1 | 7 | United States | 2003 | Cartoon Network | Traditional |
| Auld Ones | 2 | 26 | Ireland | 2003–07 | RTÉ2 | Flash |
| The Adventures of Little Brown Bear | 1 | 52 | France | 2003 | France 5 | Traditional |
| Bobinogs | 2 | 98 | United Kingdom | 2003–06 | CBeebies | Flash |
| Boo! | 2 | 104 | United Kingdom | 2003–06 | CBeebies | CGI/Traditional |
| The Booo Krooo | 1 | 6 | United Kingdom | 2003 | Channel U | Flash |
| Bounty Hamster | 1 | 26 | United Kingdom | 2003 | ITV1 | Traditional |
| Bugtime Adventures | 1 | 13 | United States | 2003 | TBN | Traditional |
| Chilly Beach | 3 | 65 | Canada | 2003–06 | CBC Television | Flash |
| Chocotte minute | 1 | 52 | France | 2003 | M6 | Traditional |
| Clifford's Puppy Days | 2 | 39 | United States | 2003–06 | PBS Kids, CBeebies | Traditional |
| Code Lyoko | 4 | 95 | France | 2003–07 | France 3 | CGI/Traditional |
| Connie the Cow | 3 | 44 | Spain | 2003–07 | Noggin, Teledeporte | Traditional |
| Cosmic Cowboys | 1 | 52 | Canada, France | 2003 [4] | | Traditional |
| Cosy Corner | 1 | 52 | France | 2003 [5] | Télétoon | CGI |
| Crawford's Corner | 1 | 13 | United States | 2003 [6] | Discovery Channel | Traditional |
| Creature Comforts | 3 | 33 | United Kingdom | 2003–07 | ITV | Stop motion |
| Cuộc phiêu lưu của Ong Vàng | 1 | 13 | Vietnam | 2003 [7] | VTV3 | |
| Da Yingxiong Di Qing | 1 | 52 | China | 2003 [8] | Shanghai Television | Traditional |
| Dip & Dap | | | Netherlands | 2003 [9] | Z@ppelin | |
| Duck Dodgers | 3 | 39 | United States | 2003–05 | Cartoon Network, Boomerang | Traditional |
| Dyatlows | 2 | 32 | Russia | 2003–04 [10] | REN TV | CGI |
| E4 Esting | 8 | 25 | United Kingdom | 2003–2018 | E4 | Stop motion/Flash/CGI |
| Eddsworld | 6 | 65 | United Kingdom | 2003–present | Newgrounds, YouTube | Flash |
| Les Enfants du feu | 1 | 26 | Canada, France | 2003 | | Traditional |
| Franny's Feet | 3 | 52 | Canada | 2003–10 | Family Channel | Flash |
| Free for All | 1 | 7 | United States | 2003 | Showtime | Traditional |
| The Frog Show | 2 | 78 | France | 2003 | M6 | Traditional |
| Gary the Rat | 1 | 13 | United States | 2003 | Spike TV | Flash |
| Generation Jets | 1 | 13 | United States | 2003–04 | WCBS-TV | Traditional |
| Gnarfs | 1 | 26 | Germany | 2003 [11] | Super RTL | Traditional |
| Gowap | 1 | 52 | France | 2003 | TF1 | Traditional |
| Guardian Fairy Michel | 1 | 26 | South Korea | 2003 | KBS2 | Traditional |
| Happy Stuff | 7 | | China | 2003 | Kaku | Traditional |
| Hello Woobi Boy | 2 | 20 | South Korea | 2003–05 | KBS2 | |
| Hermie and Friends | 1 | 16 | United States | 2003-2010 | Direct-to-video | CGI |
| Hey Joel | 1 | 13 | United States | 2003 | VH1 | Flash |
| Hey Monie! | 3 | 25 | United States | 2003 | BET, Oxygen | Flash |
| Hey Yo Yorang | 1 | 26 | South Korea, China | 2003–04 | KBS2, CCTV-6 | Traditional |
| Home Things | 1 | 26 | Portugal | 2003 | RTP2 | |
| The Hydronauts | 2 | 26 | Germany, France | 2003–04 [12] | KI.KA, France 5 | Traditional/CGI/Live action |
| Jacob Two-Two | 5 | 62 | Canada | 2003–06 | YTV | Flash (Season 1–4), Traditional (Season 5) |
| Jacques Cousteau's Ocean Tales | 1 | 26 | Canada, France | 2003 | France 3 | Traditional |
| Jakers! The Adventures of Piggley Winks | 3 | 52 | United Kingdom, United States | 2003–07 | PBS Kids | CGI |
| Jasper the Penguin | 1 | 52 | France, Germany | 2003 [13] | France 5, KI.KA | Traditional |
| Jibba Jabba | | 32 | United Kingdom | 2003 | Tiny Living | CGI |
| JoJo's Circus | 3 | 63 | Canada, United States | 2003–07 | Playhouse Disney | Stop motion |
| Jungle Beat | 4 | 62 | South Africa | 2003–present | | CGI |
| Juro que vi | 1 | 5 | Brazil | 2003–09 | | Traditional |
| Kenny the Shark | 2 | 26 | United States | 2003–05 | Discovery Kids on NBC | Traditional |
| Kid Notorious | 1 | 9 | United States | 2003 | Comedy Central | Traditional |
| Kid Paddle | 2 | 52 | Belgium, Canada, France | 2003–06 | M6 | Traditional |
| King | 2 | 52 | Canada | 2003–05 | Family Channel | Traditional |
| The Koala Brothers | 3 | 79 | Australia, United Kingdom | 2003–07 | ABC Kids, CBeebies | Stop motion |
| The Legend of Nezha | 1 | 52 | China | 2003–04 | CCTV | Traditional |
| Lilo & Stitch: The Series | 2 | 65 | United States | 2003–06 | Disney Channel | Traditional |
| Little Robots | 5 | 65 | United Kingdom | 2003–05 | CBeebies | Stop motion |
| Lola Rabbit | 2 | 52 | Germany | 2003–11 [14] | KI.KA | Traditional |
| Die Mainzels | 1 | 24 | Germany | 2003–04 [15] | ZDF | Traditional |
| Martin Morning | 4 | 160 | France | 2003–18 | France 3 | Traditional |
| Martin Mystery | 3 | 66 | Canada, France, Italy | 2003–06 | YTV | Traditional |
| Marvi Hämmer präsentiert National Geographic World | 4 | 104 | Germany | 2003–14 [16] | KI.KA | CGI/Traditional/Live action |
| Mechanick | | 45 | United Kingdom, Canada, Australia | 2003—04 | CITV (2003), Channel 5 (2004) | CGI |
| Meet the Moores | | 10 | United Kingdom | 2003 [17] | Nicktoons TV | Flash |
| Meg and Mog | 1 | 52 | United Kingdom | 2003 | CITV | Traditional |
| Megaliga MTV de VJs Paladinos | 3 | | Brazil | 2003–07 | MTV Brasil | Flash |
| Metalheads | 1 | 26 | United Kingdom | 2003–04 | CBBC | Traditional |
| Miffy and Friends | 3 | 39 | Netherlands | 2003–07 | KRO | Stop motion |
| Mole Sisters | | | Canada | 2003 | Treehouse TV | Traditional |
| Momo | 1 | 26 | Germany | 2003 | KI.KA | Traditional |
| Monkey Dust | 3 | 18 | United Kingdom | 2003–05 | BBC Three | Traditional |
| My Dad the Rock Star | 2 | 26 | Canada, France | 2003–04 | Teletoon | Traditional |
| My Life as a Teenage Robot | 3 | 40 | United States | 2003–09 | Nickelodeon, Nicktoons Network | Traditional |
| My Little Pony (2003) | | 12 | United States | 2003–09 | Direct-to-video | Traditional/Flash |
| Odd Job Jack | 4 | 52 | Canada | 2003–07 | The Comedy Network | Flash |
| PangPond the Series | 3 | 65 | Thailand | 2003–14 | Channel 3 | |
| The Paz Show | 2 | 80 | United Kingdom | 2003–06 | Discovery Kids | Flash |
| Pet Pals | 5 | 156 | Italy | 2003–12 | Rai Due | |
| Poko | 2 | 50 | Canada | 2003–08 | CBC Television | Stop motion |
| Pororo the Little Penguin | 8 | 286 | South Korea | 2003–23 | EBS1 | CGI |
| The Presentators | 3 | 20 | United Kingdom | 2003-2005 | Nickelodeon | CGI |
| Q Ban Sanguo | 1 | 39 | China | 2003 [18] | | |
| Ratz | 1 | 52 | Canada, France | 2003 | France 3, Teletoon | Traditional |
| Red Arrow | 1 | 147 | Russia | 2003–04 | NTV | CGI |
| Ren & Stimpy "Adult Party Cartoon" | 1 | 6 | Canada, United States | 2003 | Spike TV | Traditional/Flash |
| The Rosary for Kids | 1 | 4 | United States | 2003 | EWTN | Traditional |
| Sabrina's Secret Life | 1 | 26 | France, United States | 2003–04 | DIC Kids Network | Traditional |
| The Save-Ums! | 2 | 39 | Canada, United States | 2003–06 | Discovery Kids | CGI |
| The Secret World of Benjamin Bear | 4 | 52 | Canada | 2003–09 | Family Channel | Traditional |
| Sergeant Stripes | 2 | 26 | United Kingdom | 2003–04 | CBeebies | Traditional |
| Shanna's Show | 1 | 15 | United States | 2003 | Playhouse Disney | Flash |
| Silverwing | 1 | 13 | Canada | 2003 | Teletoon | Flash |
| Something Else | 1 | 26 | Canada, United Kingdom | 2003 | | Traditional |
| The Spaghetti Family | 1 | 26 | Italy | 2003–04 | Rai Tre | Traditional |
| Spheres | 1 | 26 | South Korea | 2003–04 | MBC | Traditional |
| Spider-Man: The New Animated Series | 1 | 13 | Canada, United States | 2003 | MTV | CGI |
| Star Wars: Clone Wars | 3 | 25 | United States | 2003–05 | Cartoon Network | Traditional |
| Strawberry Shortcake | 4 | 22 | United States | 2003–08 | Direct-to-video | Traditional |
| Stripperella | 1 | 13 | United States | 2003–04 | Spike TV | Traditional |
| Stuart Little | 1 | 13 | United States | 2003 | HBO Family | Traditional |
| Teen Titans | 5 | 65 | United States | 2003–06 | Cartoon Network, Kids' WB | Traditional |
| Teenage Mutant Ninja Turtles | 7 | 155 | United States | 2003–09 | 4Kids TV, The CW | Traditional |
| A Treasure in My Garden | 1 | 13 | Canada | 2003 | Télétoon/Teletoon | |
| Tutenstein | 3 | 39 | United States | 2003–08 | Discovery Kids | Traditional |
| VH1 ILL-ustrated | 2 | 13 | United States | 2003–04 | VH1 | Traditional |
| Watch My Chops! | 3 | 104 | France | 2003–16 | France 3, Gulli | Traditional (season 1), Flash (season 2) |
| Wide-Eye | 1 | 26 | United Kingdom | 2003–04 | CBeebies | Traditional |
| The Wrong Coast | 1 | 13 | Canada, United States | 2003–04 | The Movie Network | Stop motion |
| Xiaolin Showdown | 3 | 52 | United States | 2003–06 | Kids' WB | Traditional |
| Yoko! Jakamoko! Toto! | 2 | 52 | United Kingdom | 2003–05 | CITV | Flash |
| Zentrix | 1 | 26 | Hong Kong | 2003 | TVB | CGI/Traditional |
| Zip & Zap | 1 | 26 | Spain | 2003 [19] | Disney Channel | Traditional |