Marina One is a mixed-use development bounded by Marina Way and Straits View in Marina South located within the Downtown Core of the city-state of Singapore.

Designed by Christoph Ingenhoven, Marina One covers a total gross floor area of approximately 3.67 million square feet. It includes two 34-storey residential towers, two 30-storey prime grade A office towers and a retail podium named 'The Heart', featuring lush greenery and landscaping by Gustafson Porter and ICN Design. Both were landscape architects behind Singapore's Gardens by the Bay, also located in Marina South.

It was developed by M+S Pte Ltd, a 60:40 joint venture between Investment fund Khazanah National and Singapore's investment company Temasek Holdings. Wholly owned subsidiaries of the two funds - Mapletree Investments and UEM Sunrise were appointed project managers. The development broke ground on 11 July 2012 followed by the unveiling of Marina One's architectural design on 19 February 2013. It was inaugurated on 15 January 2018.