Lysianassa is the name of four characters in Greek mythology:
Lysianassa, one of the Nereids.
Lysianassa, daughter of Epaphus. She bore Poseidon a son, Busiris, king of Egypt. He was killed by Heracles.
Lysianassa, daughter of king Polybus of Sicyon. She married king Talaus of Argos and bore him Adrastus and Mecisteus.
Lysianassa, daughter of Priam.