Miyako Nanseien Sanatorium, (National Sanatorium Miyako Nanseien) is a sanatorium for leprosy and ex-leprosy patients at Miyakojima, Okinawa Prefecture, Japan, starting in 1931.

Following the establishment of 5 prefectural sanatoriums in 1909, the treatment of patients in Okinawa Prefecture was inconsistent, because of the presence of resistance to the establishment of sanatoriums.

On the Miyako Island, however, the resistance was relatively low.