The Gulf of Kyparissia (, Kyparissiakos Kolpos) is a long, curving indentation along the western coast of the Peloponnese peninsula, Greece. It lies between Cape Katakolo at the north end and Cape Konello to the south. Near the northern extreme is the city of Pyrgos, with the town of Zacharo near the center and the town of Kyparissia lying toward the southern end. Flowing into the gulf are the Alpheios and Neda rivers. Its southern part is also one of the main breeding grounds of the endangered loggerhead sea turtle.