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Foreign Fish are fishes throughout the series that appear to have a reputation of being foreign, and are seen in a few episodes.
- Hungarian Fish: A Man that appears in "Fungus Among Us" and "Drive Thru" and is the Krusty Krab's Health Inspector.
- Swedish Couple: They appear in "What Ever Happened to SpongeBob?," living in New Kelp City. They are look-alikes, of Harold "Bill" Reginald, and Millie. They are seen going through SpongeBob's clothes.
- Scottish Fish: A Blue fish that resembles Fred, that appears in "Patty Hype." He appears saying that Pretty Patties remind him of home, seeing how they are Plaid. The Scottish Fish made another minor appearance with many other Scottish fish in a parade in "SpongeBob's Last Stand."
- Sandy's Scottish Cousin: He appears in "Stanley S. SquarePants."