Marina Bay MRT station is an underground Mass Rapid Transit (MRT) interchange station on the North South (NSL), Circle (CCL) and Thomson–East Coast (TEL) lines in Singapore. Located in the Downtown Core district near Marina Bay, the station serves the Marina One Residences, Marina Bay Suites and the Marina Bay Financial Centre.

The North–South Line (NSL) is a high-capacity Mass Rapid Transit (MRT) line in Singapore, operated by SMRT Corporation. Coloured red on the Singapore rail map, the line is 45 kilometres (28 mi) long and serves 27 stations, 11 of which, between the Bishan and Marina South Pier stations, are underground. It runs from Jurong East station, located in Western Singapore, to Marina South Pier station in the Central Area, via Woodlands station in northern Singapore. The line operates for almost 20 hours a day, with headways of up to 1 to 2 minutes during peak hours and 5 to 8 minutes during off-peak hours. All the trains on the North–South Line run with a six-car formation.