- Nag (another name for a horses)
- Naked Mole Rat
- Narwhal (toothed whale with a tusk)
- Nautilus (sea mollusk with a coiled shell)
- Needle Fish
- Nelly (petrel)
- Nematode (worm)
- Neon Blue Guppy
- Neon Blue Hermit Crab
- Neon Rainbow Fish
- Neon Red Guppy
- Neon Tetra (small fish)
- Newfoundland Dog
- Newt
- Newt Nutria
- Night crawler
- Night Heron
- Nighthawk
- Nightingale
- Noddy
- Northern Cardinals
- Northern Elephant Seal
- Northern Flying squirrel
- Northern Fur Seal
- Northern Pike
- Northern Sea Horse
- Northern Spotted Owl
- Northern Right Whale
- Norway Lobster
- Norway Rat
- Nubian Goat
- Nurse shark
- Nutcracker
- Nuthatch
- Nutria (large rodent)
- Nymph (insect larva) are some of the animals that start with N.
