Ōshima (大島郡, Ōshima-gun) is a district located in Kagoshima Prefecture, Japan.
The "restoration of Ōshima District of Kagoshima Prefecture" was a slogan of the Amami reversion movement during the United States military occupation of the Amami Islands from 1945/6 to 1953.
The reversion movements except those by leftist minorities tried to differentiate Amami from Okinawa because the U.S. seemingly intended permanent control of Okinawa.
They opposed the name "Northern Ryukyu" occasionally labeled by the U.S. occupiers.
Instead they used "Ōshima District, Kagoshima Prefecture" as a symbol of national belongingness.