Tōhoku Shinseien Sanatorium or National Sanatorium Tōhoku Shinseien is a sanatorium for leprosy or ex-leprosy patients situated in Tome-shi, Miyagi-ken, Japan, founded in 1939.

Following prefectural sanatoriums, the Japanese Government decided to increase sanatoriums, starting with National Sanatorium Nagashima Aiseien Nagashima Aiseien Sanatorium in 1930.

Tohoku Shinseien Sanatorium was the 6th sanatorium which was established in 1939.

The number of in-patients is the sum of patients which changed not only by the newly diagnosed hospitalized and those who died among in-patients, by other factors such as the number of patients who escaped or were discharged, depending on the condition of the times.

Recently they were encouraged to be discharged, but the long period of the segregation policy causing leprosy stigma might influence the number of those who went into the society.