What is the name of SpongeBob's best friend?

SpongeBob’s best friend is Patrick Star.

Patrick is a pink starfish who lives beneath a rock in Bikini Bottom. His cheerful, laid-back personality contrasts with SpongeBob’s energetic optimism, but the two regularly spend time jellyfishing, getting into trouble, and trying to help one another. Patrick’s lack of practical judgment is a recurring source of comedy, not a sign that their friendship is unimportant.

The character is voiced by Bill Fagerbakke and has been part of the series since its premiere. Patrick is also SpongeBob’s neighbor, alongside Squidward Tentacles, although Squidward is better described as SpongeBob’s annoyed neighbor and co-worker than his friend.

Viewers sometimes confuse Patrick with Sandy Cheeks because Sandy is another close companion and frequent adventuring partner. Mr. Krabs owns the Krusty Krab, while Squidward works there; neither is SpongeBob’s best friend. Patrick’s defining role is the loyal, sometimes hapless companion who anchors many of the show’s friendship stories.