In ancient Roman mythology, Salacia was the female divinity of the sea, worshipped as the goddess of salt water who presided over the depths of the ocean. Neptune was her consort. That Salacia was the consort of Neptune is implied by Varro, and is positively affirmed by Seneca, Augustine and Servius. She is identified with the Greek goddess Amphitrite, consort of Poseidon.

Neptune is the Roman god of freshwater and the sea in Roman religion. He is the counterpart of the Greek god Poseidon. In the Greek-inspired tradition, he is a brother of Jupiter and Pluto; the brothers preside over the realms of heaven, the earthly world, and the seas. Salacia is his wife.