A moon of Neptune was discovered by Harold J. Reitsema, William B. Hubbard, Larry A. Lebofsky and David J. Tholen on May 24, 1981. Larissa is also designated as "Neptune VII" and "S/1981 N1". In Greek mythology, Larissa was a nymph who was a lover of Poseidon (Neptune).

Larissa is a tiny moon of Neptune. It was discovered using NASA's Voyager 2 mission in 1989. It orbits 73,550 km from the center of Neptune and is about 104 x 89 km.

In Greek mythology, Larissa (Λάρισσα) was a local nymph from Thessaly. She was described by Pausanias as a daughter of Pelasgus. However, Hellanicus states that the sons of Poseidon and Larissa were Achaios, Phthios, and Pelasgus.