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- Rabbitfish
- Radiated Tortoise (marine feeder)
- Radiolarian (microscopic marine organism)
- Rainbow Cichlid (brackish water species)
- Rainbow Parrotfish
- Rainbow Runner
- Rainbow Sardine
- Rainbow Surfperch
- Rainbow Trout (sometimes found in marine environments)
- Ragged-Tooth Shark
- Ragworm
- Rattail Fish (Grenadier)
- Razor Clam
- Razorfish
- Razorfish Wrasse
- Red Algae
- Red Anemone
- Red Bass
- Red Batfish
- Red Blenny
- Red Boarfish
- Red Cod
- Red Coris Wrasse
- Red Drum Fish
- Red Emperor Snapper
- Red Finned Shark (brackish water species)
- Red Grouper
- Red Irish Lord (Scorpaeniform fish)
- Red King Crab
- Red Knot (marine wading bird)
- Red Lipped Batfish
- Red Morwong
- Red Mullet
- Red Rock Crab
- Red Scorpionfish
- Red Sea Cucumber
- Red Sea Fan
- Red Sea Star
- Red Sea Urchin
- Red Shiner (brackish water species)
- Red Shrimp
- Red Snapper
- Red-Spotted Blenny
- Red-Spotted Toadfish
- Red Tetra (brackish water species)
- Red Toadfish
- Red Velvetfish
- Red Wolf Fish (brackish water species)
- Red-Bellied Piranha (sometimes in brackish water)
- Red-Breasted Wrasse
- Red-Eyed Medusa Jellyfish
- Red-Faced Moray
- Red-Legged Hermit Crab
- Red-Lipped Clingfish
- Red-Spotted Coral Crab
- Red-Spotted Hawkfish
- Red-Spotted Pufferfish
- Red-Tail Butterflyfish
- Red-Toothed Triggerfish
- Reef Catfish
- Reef Lizardfish
- Reef Manta Ray
- Reef Octopus
- Reef Sand Perch
- Reef Shark
- Reef Sponge
- Remora (Suckerfish)
- Ribbon Eel
- Ribbon Moray
- Ribbon Sea Urchin
- Ribbonfish
- Ringed Sea Snake
- River Goby (sometimes found in marine environments)
- Rock Beauty Angelfish
- Rock Crab
- Rock Lobster
- Rockcod (various species of groupers and basses)
- Rockfish
- Rockskipper Fish
- Rockweed (a type of marine algae)
- Rough Scad
- Rough Skate
- Rough Triggerfish
- Roughhead Blenny
- Roughhead Grenadier
- Round Goby
- Round Herring
- Round Ray
- Round Scad
- Round Stingray
- Royal Angelfish
- Royal Blue Tang
- Royal Gramma
- Ruby Seadragon
- Ruddy Turnstone (marine wading bird)
- Rugose Squat Lobster
- Russian Sturgeon
- Rusty Parrotfish
- Rusty Scorpionfish
- Rutile Moray
