2008 (MMVIII) is a leap year of the Gregorian calendar that started on a Tuesday. 32 total SpongeBob episodes aired.
- January 5 - The Gift of Gum and Goo Goo Gas premiered.
- February 18 - 20,000 Patties Under the Sea, The Battle of Bikini Bottom, Banned in Bikini Bottom, and Stanley S. SquarePants premiered.
- March 3 - "Krabby Road" premiered.
- March 4 - "Not Normal" premiered.
- March 5 - "Gone" premiered.
- March 6 - "Suction Cup Symphony" premiered.
- March 7 - "Penny Foolish" premiered.
- March 29 - "Nautical Novice" and "Spongicus" premiered.
- April 11 - "Pest of the West" premiered.
- June 2 - "The Splinter" premiered.
- June 3 - "Giant Squidward" premiered.
- June 4 - "A Life in a Day" premiered.
- June 5 - "Sun Bleached" premiered.
- June 6 - "House Fancy" premiered.
- August 4 - "No Nose Knows" premiered.
- August 5 - "Patty Caper" premiered.
- August 6 - "Plankton's Regular" premiered.
- August 7 - "Boating Buddies" premiered.
- August 8 - "The Krabby Kronicle" premiered. and Christmas Who? premiered in Australia.
- October 13 - "What Ever Happened to Spongebob?" premiered.
- October 14 - "Goo Goo Gas" direct-to-DVD premiered episode.
- November 28 - "The Slumber Party" premiered.
- November 28 - "Grooming Gary" premiered.
- November 28 - "Porous Pockets" premiered.
- November 28 - Krusty Krushers premiered.
- November 28 - The Card premiered.
- November 28 - Dear Vikings premiered.
- November 28 - Ditchin' premiered.