Thoosa is a figure from Greek mythology, known as a sea nymph and the mother of Polyphemus, one of the Cyclops. She was a daughter of the sea god, Phorcys and was known for her beauty and her role as a mother.

Thoosa was said to have been seduced by Poseidon, the god of the sea, and gave birth to Polyphemus. Polyphemus was known for his monstrous size and his single eye, which was located in the center of his forehead. He was also known for his savage nature and was feared by all who encountered him.

Thoosa did not have a prominent role in Greek mythology, but her story is interesting as it shows the power of the gods and their ability to seduce and have offspring with mortal or semi-mortal women.