Surachai Danwattananusorn (Thai: สุรชัย ด่านวัฒนานุสรณ์; born 24 December 1942, disappeared 10 December 2018) is a Thai political activist and former political prisoner. He was the last communist to be pardoned in Thailand, and after his release he entered mainstream politics, becoming a committee member of the Thai Rak Thai Party and founding the political movement. Surachai is known for his anti-monarchist views, which have resulted in a past arrest under Thailand's lèse majesté laws.