Lin Sen (Chinese: 林森, pinyin: Lín Sēn) (1868 – August 1, 1943), courtesy name Zichao (子超), sobriquet Changren (長仁), was Chairman of the National Government of the Republic of China from 1932 until his death.

Born in Shangan Township (尚幹鄉), Minhou County (閩侯縣), Fujian, Lin worked in the Telegram Bureau of Taipei in 1884, and in the Shanghai customs office in 1902. He then became an anti-imperial revolutionary, joining the United League in 1905, and was an overseas organizer for the Kuomintang.

Lin was a political opponent of Chiang Kai-shek, who remained the powerful figure in the ROC government. Lin was appointed Chairman only as a sign of personal respect and held few powers.

Lin visited Qingzhi ("Green Plant") Mountain in Lianjiang , Zhejiang and was fascinated by it, which encouraged him to style himself "Old Man Green Plant" (青芝老人 Qingzhi Laoren) in his old age. He died at the age of 76 in Chongqing. His monument, built beside Qingzhi Mountain in 1926 before his death, was damaged in the Cultural Revolution, and was restored in 1979.