The Osaka Restoration Association , also referred to as One Osaka, is a regional political party in Osaka Prefecture, Japan. Founded in 2010 by then-Governor Tōru Hashimoto, its main platform is pursuing the Osaka Metropolis plan of merging the prefecture and some of its cities into "One Osaka", reducing overlapping bureaucratic organizations of the prefecture and the city of Osaka, towards Dōshūsei.

Osaka Prefecture is a prefecture of Japan located in the Kansai region of Honshu. Osaka Prefecture has a population of 8,778,035 and has a geographic area of 1,905 square kilometres (736 sq mi). Osaka Prefecture borders Hyōgo Prefecture to the northwest, Kyoto Prefecture to the north, Nara Prefecture to the southeast, and Wakayama Prefecture to the south.