Plankton is a disambiguation. It may refer to:
- Sheldon J. Plankton – Founder of the Chum Bucket and rival of Mr. Krabs.
- Gordon Plankton – Sheldon's father.
- Karen Plankton – Sheldon's wife.
- Grandma Plankton – Sheldon's grandmother.
- Plankton's Cousins – Sheldon's cousins.
- Plankton Family – Sheldon's family.
- Plankton's Robot – A robot customer seen in "Plankton's Army."
- Mr. Charleston – A human version of Plankton who appears in "SpongeBob's Big Birthday Blowout."
- PlanKrab – A mixer of Plankton and Mr. Krabs who appears in The Krusty Bucket.
- Robo-Plankton – The main villain of the video games Battle for Bikini Bottom and Battle for Bikini Bottom - Rehydrated.
- Plankton zombies – A group of zombies of Planktons who appears in the online game Plankton's Fun House.
- PlanktoBot – A giant robot which appears in the video game SpongeBob's Truth or Square.
- Plankton robot – The robot version of Plankton which appears in three episodes of the main series and The SpongeBob Movie: Sponge Out of Water.
- Plankton! – A Season 1 episode.
- Plankton's Army – A Season 3 episode.
- Krabs vs. Plankton – A Season 4 episode.
- Plankton's Regular – A Season 6 episode.
- Walking the Plankton – A Season 8 episode
- Plankton's Good Eye – A Season 8 episode.
- Plankton's Pet – A Season 9 episode.
- Plankton Gets the Boot – A Season 10 episode.
- Plankton Retires – A Season 10 episode
- Plankton Paranoia – A Season 11 episode.
- King Plankton – A Season 12 episode.
- Plankton's Old Chum – A Season 12 episode.
- Plankton's Intern – A Season 12 episode.
- Plankton's Fun House – An online game.
- Plankton's Pernicious Plot – An online game.
- Plankton's Krusty Bottom Weekly – An online game.
- Plankton Pong – An online game.
- Plankton's Patty Plunder – An online game.
- Plankton's Robotic Revenge – Video game released in 2013.
- Sheldon Plankton: Mean and Green – A digital DVD featuring some of Plankton's major episodes.