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- Uaru Cichlid (brackish species)
- Ubiquitous Goby
- Uganda Blenny
- Uganda Coral Shrimp
- Ugly Batfish
- Umbrella Crab
- Umbrella Jellyfish
- Umbrella Octopus
- Umbrella Shell Snail
- Unarmored Threespine Stickleback (brackish species)
- Unicorn Crestfish
- Unicorn Filefish
- Unicorn Leatherjacket
- Unicornfish
- Undulate Moray Eel
- Undulate Ray
- Underwater Firefly Squid
- Underwater Lanternfish
- Underwater Paper Nautilus
- Underwater Sea Spider
- Underwater Spiny Lobster
- Upside-Down Catfish (some brackish species)
- Upside-Down Jellyfish
- Urchin Clingfish
- Urchin Crab
- Urchin Shrimp
- Urchin Sponge Crab
- Urobatis Stingray
- Urotrygon Stingray
- Uruguay River Crab (found in estuaries)
