Losheng Sanatorium (Chinese: 樂生療養院) is a hospital for lepers, which is located in Xinzhuang District, New Taipei City (formerly Taipei County), Taiwan. Losheng means "happy life". It was constructed in the 1930s during the Japanese colonial period.
衛生福利部樂生療養院，民間俗稱樂生院，是台灣一座公立醫院，為中華民國衛生福利部所屬醫院之一。樂生是台灣第一間痲瘋病院，作為慢性傳染病、癩病防治的專門機構。