| Tan Soo Khoon | |
| Office: | 4th Speaker of the Parliament of Singapore |
| Term Start: | 9 January 1989 |
| Term End: | 18 October 2001 |
| Deputy: | Abdullah Tarmugi Eugene Yap |
| Predecessor: | Yeoh Ghim Seng |
| Successor: | Abdullah Tarmugi |
| Office1: | Deputy Speaker of the Parliament of Singapore |
| Term Start1: | 1985 |
| Term End1: | 1989 |
| Predecessor1: | Hwang Soo Jin |
| Successor1: | Lim Boon Heng |
| Constituency Mp2: | East Coast GRC (Kampong Chai Chee) |
| Parliament2: | Singapore |
| Term Start2: | 3 January 1997 |
| Term End2: | 20 April 2006 |
| Predecessor2: | Constituency established |
| Successor2: | Lee Yi Shyan |
| Constituency Mp3: | Bedok GRC (Kampong Chai Chee) |
| Parliament3: | Singapore |
| Term Start3: | 21 August 1991 |
| Term End3: | 16 December 1996 |
| Predecessor3: | Hong Hai |
| Successor3: | Constituency abolished |
| Constituency Mp4: | Brickworks GRC (Alexandra) |
| Parliament4: | Singapore |
| Term Start4: | 3 September 1988 |
| Term End4: | 14 August 1991 |
| Predecessor4: | Constituency established |
| Successor4: | Constituency abolished |
| Constituency Mp5: | Alexandra SMC |
| Parliament5: | Singapore |
| Term Start5: | 23 December 1976 |
| Term End5: | 17 August 1988 |
| Predecessor5: | Wong Lin Ken |
| Successor5: | Constituency abolished |
| Birth Date: | 1 September 1949 |
| Birth Place: | Colony of Singapore |
| Party: | People's Action Party |
| Alma Mater: | University of Singapore |
Tan Soo Khoon (Chinese: c=陈树群|p=Chén Shùqún; born 1 September 1949) is a Singaporean former politician who served as Speaker of the Parliament of Singapore between 1989 and 2001.
Tan attended the Anglo-Chinese School before graduating from the University of Singapore (now the National University of Singapore) in 1971 with an honours degree in business administration.
He also served as the general secretary of the students' union of the University of Singapore (now the National University of Singapore) in 1969.
Tan started assisting in the Kuo Chuan constituency in 1971, where he learned about the needs of the working-class in Singapore society.
It is his strong desire for social equality and improving the lives of the less fortunate that has made his parliamentary speeches well known amongst his fellow MPs.
Tan took a 13-year break from speech-making when he became speaker. He is remembered for his fairness to both sides of the floor of the house, allowing members of both the governing party and the opposition to speak their minds. He is also remembered for his sense of humor, for his notes to fellow MPs would be signed off "The Watchman", a take on his private business, and his role as speaker.
During his stint as the speaker, he was also president of the AIPO (ASEAN Inter-Parliamentary Organization) for the 1989–1990, 1994–1995 and 1999–2000 sessions. He also served as acting president of Singapore on a number of occasions when the president and deputy prime minister were both out of the country on official business.
Tan also supervised the building of the new Parliament House, heading the Committee on the Parliament Complex Development Project. The new building was completed in 1999, and a ceremony was conducted to officiate the "move" from the old Parliament House near the Supreme Court to the new one along the Singapore River.
In April 2002, when he stepped down as speaker after 13 years,[1] Tan immediately made it known that as a backbencher, with his brutal honesty and openness, he could still "shake the House". Many of his speeches provided witty, pointed, even scathing, remarks about certain government policies and expenditures, such as the extravagance of certain public buildings and the rising cost of public transportation.
In a tribute by Prime Minister Lee Hsien Loong on 15 April 2006, he said of Tan, "He makes very good speeches in Parliament. Sometimes, he draws blood... Sometimes he has offended ministers, but he has spoken his mind."
Tan's maternal grandfather is Lee Wee Nam, born 1880, who was one of the most prominent Teochew Chinese figures in Singapore's history. Lee was the founder of Lee Hiok Kee Pte Ltd and chairman of the Four Seas Communications Bank.