Chia Thye Poh (born 1941) is a Singaporean former politician. A former member of the Barisan Sosialis, he was the Member of Parliament (MP) for the Jurong SMC between 1963 and 1966. A leftist populist, Chia is most notable for being detained between 1966 and 1989 under the Internal Security Act for allegedly conducting pro-communist activities against the government, with the intention of causing a communist revolution. As a result, he was imprisoned for 23 years without trial and subsequently placed under conditions of house arrest for another nine years—in which he was first confined to the island of Sentosa and then subject to restrictions on his place of abode, employment, travel, and exercise of political rights. All restrictions were eventually lifted in 1998.