Morrillito is a small uninhabited island off the southern coast of Puerto Rico. The island is protected by the Reserva Natural Caja de Muertos natural reserve because of its native turtle traffic. Together with Caja de Muertos, Gatas, Ratones, Cardona, Isla del Frio, and Isla de Jueyes, Morrillito is one of seven islands ascribed to the municipality of Ponce.