| Native Name: | 蕭玉燦 |
| Native Name Lang: | zh |
| Birth Date: | 23 March 1914 |
| Birth Place: | Kapasan, Surabaya, East Java, Dutch East Indies |
| Death Place: | Leiden, Netherlands |
Siauw Giok Tjhan (; 23 March 1914 – 20 November 1981) was a Chinese Indonesian activist and politician. Born in Kapasan, Surabaya, East Java, Indonesia, he was an independent member in the Provisional House of Representatives in the early 1950s. He was briefly detained without charge during the August 1951 mass arrests. He became a cabinet minister under Indonesia president Sukarno and was imprisoned for 12 years by the subsequent president, Suharto. He was active in rights campaigning and was part of Baperki, including as the group's leader. He supported the Communist takeover of China, opposed to Taiwan, and was a Marxist.[1]