The following is a list of events affecting Philippine television in 2003. Events listed include television show debuts, finales, cancellations, and channel launches, closures and rebrandings, as well as information about controversies and carriage disputes.
| Date | Show |
|---|---|
| January 6 | Ultraman Cosmos on Net 25 |
| January 13 | Altagracia on ABS-CBN 2 |
| January 20 | Twin Stars on GMA 7 |
| January 27 | Ángela on GMA 7 |
| February 1 | Dragon Ball GT on GMA 7 |
| February 3 | Teysi on ABS-CBN 2 |
| February 10 | OPTV on RPN 9 |
| February 14 | on Studio 23 |
| February 15 | Sabado Barkada on ABS-CBN TV-4 Bacolod |
| February 17 | Knockout on GMA 7 |
| Islands Life on RPN 9 | |
| February 22 | Masayang Tanghali Bayan on ABS-CBN 2 |
| February 23 | PBA on NBN/IBC on NBN 4 and IBC 13 |
| February 24 | Nagmamahal, Manay Gina on GMA 7 |
| Daimos on GMA 7 | |
| March 3 | Darating ang Umaga on ABS-CBN 2 |
| Harsh Realm on RPN 9 | |
| March 4 | Game Channel on IBC 13 |
| March 8 | Amazing Twins on IBC 13 |
| March 17 | on ABS-CBN 2 |
| Slam Dunk on GMA 7 | |
| March 22 | RPN News Update on RPN 9 |
| on ABS-CBN 2 | |
| March 29 | Iyo Ang Katarungan on IBC 13 |
| April 4 | Hour of Power on IBC 13 |
| April 14 | Ang Iibigin ay Ikaw Pa Rin on GMA 7 |
| April 21 | Crush Gear Turbo on ABS-CBN 2 |
| Gata Salvaje on ABS-CBN 2 | |
| April 25 | Joe Millionaire on Studio 23 |
| The Dead Zone on RPN 9 | |
| April 28 | Dora the Explorer on GMA 7 |
| Cerge for Truth on RPN 9 | |
| April 29 | Madam Ratsa Live! on RPN 9 |
| April 30 | Nuts Entertainment on GMA 7 |
| Prangkahan on RPN 9 | |
| May 1 | Dee's Day on RPN 9 |
| May 2 | A Second Look on RPN 9 |
| May 3 | RPN Forum on RPN 9 |
| May 5 | Cooking Master Boy on ABS-CBN 2 |
| Meteor Garden on ABS-CBN 2 | |
| May 9 | Private I on ABS-CBN 2 |
| May 10 | Kontrobersyal on ABS-CBN 2 |
| May 11 | Alias on Studio 23 |
| May 19 | Shaman King on GMA 7 |
| Sana'y Wala Nang Wakas on ABS-CBN 2 | |
| May 22 | Celebrity DAT Com on IBC 13 |
| May 26 | Basta't Kasama Kita on ABS-CBN 2 |
| May 28 | Give Us This Day on ACQ-KBN 43 Davao |
| May 31 | Buttercup on ABS-CBN 2 |
| June 9 | Narito ang Puso Ko on GMA 7 |
| My MVP Valentine on GMA 7 | |
| June 11 | on Studio 23 |
| June 16 | Birds of Prey on Studio 23 |
| Rosalinda on GMA 7 | |
| June 21 | Search for a Star on GMA 7 |
| June 23 | Poor Prince on GMA 7 |
| June 28 | Kidcetera on IBC 13 |
| June 30 | Lavender on GMA 7 |
| July 13 | Love to Love on GMA 7 |
| July 14 | Alice in Wonderland on GMA 7 |
| Hawak Ko ang Langit on GMA 7 | |
| July 25 | Thieves on Studio 23 |
| July 28 | Meteor Rain on ABS-CBN 2 |
| ABS-CBN Insider on ABS-CBN 2 | |
| August 9 | Super Gals on ABS-CBN 2 |
| Tara Tena on ABS-CBN 2 | |
| Meteor Garden II on ABS-CBN 2 | |
| August 16 | Home Along da Airport on ABS-CBN 2 |
| August 17 | Ang Tanging Ina on ABS-CBN 2 |
| August 18 | Por ti on ABS-CBN 2 |
| Baki the Grappler on GMA 7 | |
| August 25 | The Agency on RPN 9 |
| Endless Love: Autumn in My Heart on GMA 7 | |
| August 28 | Dong Puno Live on ABS-CBN 2 |
| September 1 | Daisy Siete on GMA 7 |
| Bright Girl on GMA 7 | |
| Extra Challenge on GMA 7 | |
| September 3 | Special Assignment on ABS-CBN 2 |
| September 15 | Project Arms on ABS-CBN 2 |
| My Love, Cindy on GMA 7 | |
| Secretly In Love on GMA 7 | |
| September 19 | on Studio 23 |
| September 22 | Katri, Ang Batang Pastol on GMA 7 |
| Love Scar on ABS-CBN 2 | |
| Beautiful Days on GMA 7 | |
| September 24 | Next Level Na! Game Ka Na Ba? on ABS-CBN 2 |
| September 29 | Marmalade Boy on GMA 7 |
| October 4 | Super Yoyo on GMA 7 |
| May Puso ang Batas on RPN 9 | |
| October 5 | SpongeBob SquarePants on Studio 23 |
| October 6 | Yu-Gi-Oh! Duel Monsters on ABS-CBN 2 |
| Combat Missions on Studio 23 | |
| October 14 | Fastlane on Studio 23 |
| October 20 | Lagot Ka, Isusumbong Kita on GMA 7 |
| Twin Hearts on GMA 7 | |
| October 21 | All Together Now on GMA 7 |
| October 27 | StarStruck on GMA 7 |
| November 2 | Girls Machine On! on ABS-CBN 2 |
| November 3 | on ABS-CBN 2 |
| November 7 | Mutant X on Studio 23 |
| November 8 | Simpleng Hiling on ABS-CBN 2 |
| Star in a Million on ABS-CBN 2 | |
| Celebrity Turns with Junee and Lani on GMA 7 | |
| November 10 | Walang Hanggan on GMA 7 |
| November 12 | 8 Simple Rules on RPN 9 |
| Scrubs on RPN 9 | |
| November 16 | Captain Fatz on GMA 7 |
| November 17 | Funny Wild Girl on GMA 7 |
| Retro TV on IBC 13 | |
| Meteor Fever in Manila on ABS-CBN 2 | |
| Endless Love: Winter Sonata on GMA 7 | |
| At the Dolphin Bay on GMA 7 | |
| November 22 | Victim on ABS-CBN 2 |
| November 30 | Shaider on GMA 7 |
| Kay Susan Tayo! on GMA 7 | |
| December 1 | My Annette on GMA 7 |
| Lady Lady on ABS-CBN 2 | |
| Christmas from the Heart on ACQ-KBN 43 Davao | |
| December 2 | Bio Data on GMA 7 |
| December 8 | Astro Boy on ABS-CBN 2 |
| It Might Be You on ABS-CBN 2 | |
| Maria del Carmen on GMA 7 |
| Show | Last aired | Retitled as/Season/Notes | Channel | Return date | |
|---|---|---|---|---|---|
| Magandang Tanghali Bayan | 2003 | Masayang Tanghali Bayan | ABS-CBN | February 22 | |
| RPN NewsBreak | RPN News Update | RPN 9 | March 22 | ||
| Arangkada Xtra Balita | Arangkada Balita | March 24 | |||
| Ang Iibigin ay Ikaw | 2002 | Ang Iibigin ay Ikaw Pa Rin | GMA Network | April 14 | |
| Dong Puno Live | 2000 | Same | ABS-CBN | August 28 | |
| Extra Extra | 2003 | Extra Challenge | GMA Network | September 1 | |
| Assignment | 2001 | Special Assignment | ABS-CBN | September 3 |
| Date | Show | No. of seasons | Moved from | Moved to |
|---|---|---|---|---|
| May 11 | Alias | ABS-CBN | Studio 23 | |
| October 5 | SpongeBob SquarePants | RPN 9 | ||
| November 8 | Philippine Basketball League | NBN 4 | ||
| November 30 | Shaider | IBC 13 | GMA Network | |
| Unknown | Tipong Pinoy | GMA Network | Studio 23 | |
| Bitag | ABC 5 | IBC 13 | ||
| Crayon Shin-chan | IBC 13 | ABC 5 | ||
| Carita de Ángel | RPN 9 | |||
| Por un beso | ||||
| Date | Branding | Channel | Sign-on debut | Source | |
|---|---|---|---|---|---|
| June 1 | 31 | October 31, 1993 (as CTV-31) | |||
| July 31 | May 6, 1996 |