2013 (MMXIII) started on Tuesday of the Gregorian calendar.
| Date | Event(s) | |
|---|---|---|
| January 1 | Squid Defense premiered. | |
| January 6 | Mr. Dr. Professor Patrick became a bureaucrat. | |
| January 7 | CalzoneManiac joined the wiki. | |
| January 15 | Extreme Kah-Rah-Tay was released. | |
| January 19 | Plankton's Pet premiered. | |
| January 24 | User:Spongebob456's bot, Spongebot456, got flagged. | |
| February 18 | Disorder in the Deep was released. | |
| March 2 | Little Yellow Book premiered. | |
| March 6 | WiseBen became a chat mod. | |
| March 8 | CalzoneManiac became a bureaucrat for the first time. | |
| March 9 | Evil Spatula premiered. | |
| March 12 | The Complete Eighth Season was released. | |
| March 16 | Jailbreak! premiered. | |
| April 6 | SpongeyTube became an admin. | |
| April 12 | Plankton's Diary: Karen premiered. | |
| April 19 | SpongeBob SquarePants 4-D: The Great Jelly Rescue! was opened. Plankton's Diary: Evil Laugh premiered. | |
| April 21 | Conker's Bad Fur Day made his last edit. User:Sesame Street Of Elmo Fan 2013 became a chat mod. | |
| April 23 | Hockeyben lost his or her adminship for the second time. | |
| May 2 | Sweet & Sour Squidward was released. | |
| May 6 | Patapon Donchaka joined the wiki. | |
| May 16 | Patapon Donchaka became a rollback. | |
| May 18 | SBK098 became a chat mod. | |
| May 19 | Josephyr joined the wiki. | |
| May 24 | Puppets lost his or her adminship for the first time. Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd lost his or her adminship for the second time. Cheese Lord lost his or her adminship. | |
| May 25 | Safe Deposit Krabs premiered. Ggianoli became a chat mod. | |
| May 29 | AW10 became a bureaucrat. | |
| May 30 | AW10's bot, AW10bot, got flagged. | |
| June 3 | Spongedon became a chat mod. | |
| June 7 | Da Nerd became a chat mod. | |
| June 9 | Plankton's Diary: Plankton's Evil Plan premiered. | |
| June 21 | Happy2432 became a chat mod. | |
| June 25 | Tvguy347 lost his or her bureaucrat status. AMK152 started the second round of the discussion to rename the wiki. | |
| July 4 | Loopa23 joined the wiki. | |
| July 11 | AW10 opened the Credits articles discussion. | |
| July 14 | Airhogs777 made his or her last edit on this wiki. | |
| July 17 | Loopa23 became a chat mod. | |
| July 18 | AW10 closed the Credits articles discussion. | |
| July 26 | Muchacha joined the wiki. | |
| July 29 | Conker's Bad Fur Day lost his adminship. | |
| August 5 | SpongeBob on Tour was released. | |
| August 20 | AMK152 opened the Abandon SBU discussion. | |
| August 21 | Jjsthekid lost his bureaucrat status. 120d opened the Character galleries discussion. AW10 opened the Design changes discussion. AMK152 closed the Abandon SBU discussion. | |
| August 22 | Mr.Dr.professor Patrick lost his bureaucrat status. | |
| September 7 | Tanhamman joined the wiki. | |
| September 15 | Enigmatic Mr. L made his or her last edit on this wiki. | |
| September 18 | Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd made his or her last edit on the wiki. | |
| September 20 | AW10 closed the Design changes discussion. | |
| September 23 | AW10 closed the Character galleries discussion. | |
| September 24 | IHeartSpongeBob made his last edit on the wiki. | |
| September 26 | BatJarleyPatrickCher lost his or her adminship. | |
| September 29 | FrostyLemon lost his or her adminship. | |
| October 5 | 120d started the Banning Spoilers discussion and Location galleries discussion. | |
| October 11 | Plankton's Robotic Revenge was released in Europe. | |
| October 14 | Don't Look Now and Séance Shméance premiered. Jjsthekid made his last edit on the wiki. | |
| October 15 | It's a SpongeBob Christmas! Blu-ray was released in America. Cheese Lord made his or her last edit. | |
| October 18 | Plankton's Robotic Revenge was released in Russia. | |
| October 21 | CalzoneManiac became a bureaucrat for the second time. Airhogs777 lost his or her adminship. | |
| October 22 | Plankton's Robotic Revenge was released in North America.
{{Timeline|October 26|FrostyLemon made his or her last edit. | |
| October 27 | IHeartSpongeBob lost his adminship. 120d started the first background contest. Aw10 closed Location galleries discussion. | |
| October 28 | The Complete Eighth Season was released in the UK. | |
| November 2 | Loopa23 became an admin and lost his or her chat mod status. | |
| November 11 | SpongeBob You're Fired premiered. | |
| December 2 | 120d opened the discussion to add fields to the character infobox. | |
| December 3 | AMK152 opened the SpongeBuddy Mania transcript discussion and 2013 Policy revisions discussion and closed the 2013 Policy revisions discussion. | |
| December 8 | 120d closed the first background contest.
{{Timeline|December 21|CalzoneManiac started a discussion to delete empty galleries. | |
| December 22 | Puppets became admin for the second time. Laserdance lost his chat mod status. | |
| December 26 | BatJarleyPatrickCher made his or her last edit on the wiki. | |
| December 30 | AMK152 opened the Transcript review discussion. | |
| December 31 | Aw10 closed the discussion to add fields to the character infobox. | |