2005 (MMV) was a common year of the Gregorian calendar that started on a Saturday. No new episodes aired until May 6, due to rumors that the show would end. After Good Neighbors, no episodes aired untilSelling Out, which aired on September 23, 2005.
| Date | Event(s) | |
|---|---|---|
| January 1 | The SpongeBob SquarePants Movie was released in theaters in Columbia. The Great Snail Race book and SpongeBob's Easter Parade were released. | |
| January 4 | The Home Sweet Pineapple DVD and VHS were released. | |
| January 6 | The SpongeBob SquarePants Movie was released in theaters in Australia, New Zealand, and Argentina. | |
| January 7 | The SpongeBob SquarePants Movie was released in theaters in Central America. | |
| January 13 | The SpongeBob SquarePants Movie was released in theaters in Peru. | |
| January 28 | The SpongeBob SquarePants Movie was released in theaters in Spain. | |
| February 2 | The SpongeBob SquarePants Movie was released in theaters in Belgium. | |
| February 3 | The SpongeBob SquarePants Movie was released in theaters in the Netherlands. | |
| February 8 | Gone Jellyfishin' was released. | |
| February 9 | The SpongeBob SquarePants Movie was released in theaters in France. | |
| February 11 | The SpongeBob SquarePants Movie was released in theaters in the United Kingdom and Ireland. | |
| March 1 | The SpongeBob SquarePants Movie DVD and VHS were released. | |
| March 11 | The SpongeBob SquarePants Movie was released in theaters in Austria. | |
| March 13 | The SpongeBob SquarePants Movie was released in theaters in Turkey. | |
| March 17 | The SpongeBob SquarePants Movie was released in theaters in Russia, Singapore, China, India, and Czechloslovakia. | |
| April 2 | Nickelodeon Blimp premiered. | |
| April 5 | The SpongeBob Saves the Day book was released. | |
| April 6 | The SpongeBob SquarePants Movie was released in theaters in the Philippines. | |
| April 8 | The SpongeBob SquarePants Movie was released in theaters in South Africa. | |
| April 12 | SpongeBob SquarePants: The Movie was released. | |
| April 16 | The SpongeBob SquarePants Movie was released in theaters in Indonesia. | |
| May 6 | Fear of a Krabby Patty and Shell of a Man premiered. | |
| May 13 | The Lost Mattress and Krabs vs. Plankton premiered. | |
| May 20 | Skill Crane and Good Neighbors premiered. | |
| May 24 | The Fear of a Krabby Patty DVD and VHS and Nick Picks Volume 1 were released. | |
| June 2 | SpongeBob SquarePants 4-D: Ride was opened. | |
| June 7 | Gone Nutty was released. | |
| June 10 | The SpongeBob SquarePants Movie was released in theaters in Denmark. | |
| June 17 | The SpongeBob SquarePants Movie was released in theaters in Norway. | |
| June 26 | The SpongeBob SquarePants Movie was released in theaters in Sweden. | |
| June 30 | The Endless Summer premiered. | |
| August 9 | Meow... Like a Snail was released. | |
| September 16 | The SpongeBob SquarePants Movie is released in theaters in Greece. | |
| September 20 | Absorbing Favorites was released. | |
| September 23 | Selling Out premiered. The SpongeBob SquarePants Movie was released in theaters in Italy. | |
| September 27 | SpongeBob Goes to the Doctor and The Complete 3rd Season were released. | |
| September 30 | Funny Pants premiered. The SpongeBob SquarePants Movie was released in theaters in South Korea. | |
| October 7 | Mermaid Man and Barnacle Boy VI: The Motion Picture premiered. | |
| October 1 | Stop the Presses! was released. | |
| October 14 | Enemy In-Law premiered. | |
| October 18 | Nick Picks Volume 2 was released. | |
| October 19 | Lights, Camera, Pants! was released on PC, GameCube, and Game Boy Advance. | |
| October 21 | Patrick SmartPants premiered. Lights, Camera, Pants! was released on Xbox and PlayStation 2. | |
| October 26 | Nicktoons Unite! was released in North America on PlayStation 2, Game Boy Advance, and GameCube. | |
| November 4 | SquidBob TentaclePants premiered. | |
| November 7 | The Yellow Avenger was released on DS. | |
| November 11 | Have You Seen This Snail? premiered. | |
| November 15 | The Where's Gary? DVD and VHS and The Yellow Album were released. | |
| November 24 | Pat Morita died. | |