Billy may refer to:
- Billy, son of Mable Monica, as seen in Squirrel Jokes.
- Billy, adoptive son of Evelyn.
- Billy, a child as seen in Penny Foolish.
- Billy, he is seen in Professor Squidward, and in other episodes.
- Billy, pet of Brad, as seen in Gary in Love
- Billy the Orca, a killer whale seen in SpongeGuard on Duty.
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