- Mackerel
- Mackerel Shark
- Mahi-Mahi (Dolphinfish)
- Mako Shark
- Mandarinfish
- Man-of-War Fish
- Mangrove Crab
- Mangrove Jellyfish
- Mangrove Killifish
- Mangrove Ray
- Marbled Catshark
- Marbled Cone Snail
- Marbled Electric Ray
- Marbled Flounder
- Marbled Goby
- Marbled Grouper
- Marbled Moray Eel
- Marbled Stargazer
- Marine Angelfish
- Marine Betta
- Marine Catfish
- Marine Cone Snail
- Marine Iguana
- Marine Isopod
- Marine Lamprey
- Marine Otter
- Marine Worm
- Masked Butterflyfish
- Masked Pufferfish
- Mauve Stinger Jellyfish
- Megamouth Shark
- Melon-Headed Whale
- Menhaden
- Mexican Barnacle
- Mexican Hogfish
- Mexican Lookdown Fish
- Mexican Needlefish
- Milkfish
- Miniature Seahorse
- Mirror Dory
- Mitsukurina (Goblin Shark)
- Mola Mola (Ocean Sunfish)
- Mollusk
- Moorish Idol
- Moon Crab
- Moon Jellyfish
- Moonfish
- Moorish Idol Fish
- Mosaic Leatherjacket
- Mosaic Moray Eel
- Mottled Eel
- Mottled Skate
- Mozambique Tilapia
- Mud Crab
- Mudskipper
- Mullet
- Multicolor Angelfish
- Multicolor Parrotfish
- Murray River Rainbowfish
- Mussel
- Mustard Tang
- Mustard-Banded Moray
- Mustelus (Smoothhound Shark)
- Mute Swan (Marine Coastal Bird)
- Mutton Snapper
- Myctophid (Lanternfish family)
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