The Marymount Single Member Constituency is a single member constituency (SMC) located in the central area of Singapore. It is managed by Bishan–Toa Payoh Town Council. The current Member of Parliament (MP) is Gan Siow Huang from the People's Action Party (PAP).

Prior to the 2020 general election, Marymount SMC was carved from Bishan–Toa Payoh Group Representation Constituency (GRC); the five-seat GRC lost a seat to become a four-seat one. Incumbent Bishan–Toa Payoh GRC MP Josephine Teo, who had been representing areas located in the SMC, was redeployed to Jalan Besar GRC, a move she called "renewal" of the PAP. Gan, then a political newcomer, was sent to contest the SMC, winning 55.04% of the vote against Ang Yong Guan from the Progress Singapore Party (PSP).

In the 2025 general election, Gan stood for re-election in the SMC. She defeated Jeffrey Khoo from the PSP with an improved 70.73% of the vote.

Note: The Elections Department does not include rejected votes when calculating the vote shares of candidates. Hence, all candidates' vote shares will total to 100% at any given election (may not appear so in multi-way contests due to rounding).