三河湾
is a peninsula in southern Aichi Prefecture, central Honshū, Japan. It has an approximate length of east-west, separating Mikawa Bay (to the north) from the Philippine Sea to the south, with Ise Bay lying to its west. It faces the Chita Peninsula, to the northwest, across the entrance to Mikawa Bay. It has a width ranging from to , and its highest point is . Its total area is approximately 200 square kilometers.