Satellite photo of northern Osaka Bay

Osaka Bay (大阪湾 Osaka-wan) is a bay in southern Japan, separated from the Pacific Ocean by the Kii Channel and from the Harima Gulf by the Akashi Strait . Its western shore is formed by Awaji Island, and its northern and eastern shores are part of the Kansai metropolitan area.

Major ports on Osaka Bay include Osaka, Kobe, Nishinomiya, Sakai, Amagasaki, and Hannan.

A number of artificial islands have been created in Osaka Bay in past decades, including Kansai International Airport, Port Island, and Rokko Island.

Several islands at the south end of Osaka Bay are part of the Seto Inland Sea National Park .