Losheng Sanatorium (Chinese: 樂生療養院; pinyin: Lèshēng Liáoyǎngyuàn) is a hospital for lepers, which is located in Xinzhuang District, New Taipei, Taiwan. Losheng means "happy life". It was constructed in the 1930s during the Japanese colonial period.
At present there has been heated debates and protests about the plans to replace Losheng Sanatorium with a MRT (Mass Rapid Transport) depot.
Losheng Sanatorium, originally named Rakusei Sanatorium for Lepers of Governor-General of Taiwan Taiwan Sōtokufu Raibyō Rakuseiin (臺灣總督府癩病療養樂生院?), was built in 1929 during the Japanese colonial period and served as an isolation hospital for leprosy patients at that time. The Japanese government forced leprosy patients to live in this hospital. The first 5 buildings could house more than 100 patients.
During the 1930s, Losheng Sanatorium was the first leprosy hospital and the only public sanatorium for leprosy patients in Taiwan. It was designed for quarantine and treatment of lepers. With a force of sanitary police and medical officers; investigation, quarantine, and imprisonment of lepers was conducted thoroughly in the period from 1934 till the end of colonial governance of Japan. As a result, Losheng Sanatorium became the institution of compulsory quarantine as well as lifelong imprisonment for thousands of leprosy patients. The successive KMT regime inherited the policy in its early years.
After the discovery of new Leprosy treatment, patients were later allowed to leave Losheng Sanatorium since 1954. However, many of them who had undergone chronic isolation and faced discrimination had little choice but to stay and have grown used to the settings.