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Chua Chu Kang Single Member Constituency (Traditional Chinese: 蔡厝港單選區;Simplified Chinese: 蔡厝港单选区) is a defunct Single Member Constituency (SMC) located in the western region of Singapore. The constituency encompasses Choa Chu Kang New Town. It is one of the oldest surviving constituencies in Singapore, and has existed since 1959 to 2011.
Throughout its relatively long history, the ruling People's Action Party has won the constituency in every election, except the 1963 general election when it lost the seat to now defunct opposition party Barisan Sosialis. Chua Chu Kang SMC faced a four-cornered fight, including the ruling party itself in the 1997 general election and the PAP was challenged by Singapore Democratic Alliance's Steve Chia in the 2001 and 2006 general elections. In the 2011 general election, the SMC and Hong Kah Group Representation Constituency (GRC) were absorbed into Chua Chu Kang GRC. However, a new SMC, Hong Kah North SMC was crafted out of the new Chua Chu Kang GRC.
It is the longest existing SMC that existed between 1959 and 2011, which is far behind than the former Prime Minister Lee Kuan Yew from 1955 to 2015 where other people retired earlier, the last is Ho Kah Leong which outlasted from 1966 to 1997. Some of the constituencies were shifted to Yew Tee and Keat Hong respectively when Choa Chu Kang was developed in the 1990s. A few of the constituencies has been interrupted due to the GRC system, and most were removed and replaced by the younger constituencies due to the development.