The earliest modern contact between Mongolia and the Republic of Singapore (Mongolian: Сингапур-Монголын харилцаа, Chinese: 新加坡—蒙古关系, Tamil: சிங்கப்பூர்-மங்கோலியா உறவுகள்) started in 1950, and both countries established diplomatic relations in 1970.

The first dated interaction was in 1320, when envoys of the Yuan Dynasty (part of the Mongol Empire) were sent to obtain elephants from Long Ya Men (龍牙門, Dragon's Teeth Gate, the entrance to present-day Keppel Harbour in Singapore); the people of Long Ya Men subsequently visited the court of Yesün Temür in 1325 with a tribute and trade mission.

[9] In 1990, B. Sharavsambuu, the Vice Chairman of the Councils of Minister of Mongolia, visited Singapore, marking the first official contact between the two countries.

In 2008, the consulate-general became an embassy and Gansukh Purevjav became the first resident ambassador of Mongolia to Singapore,[8] Delgermaa Banzragch in 2012,[10] and in 2015 T.Lkhagvadorj (who also served as Dean of the Diplomatic Corps in 2020).

[17] Other high-level visits to Singapore took place in 2019 and 2020, by the Mongolian Minister for Foreign Affairs D. Tsogtbaatar (5-8 June 2019),[18] and the Speaker of the Parliament of Mongolia, G. Zandanshatar, in January 2020.

[27][better source needed] According to the data from The Observatory of Economic Complexity, the exported values from Singapore to Mongolia were between 10 and 20 million US dollars.

[29] Singapore and Mongolia signed agreements among air services, promotion and reciprocal protection of investments and avoidance of double taxation in 1993, 1995 and 2003, separately.

[39] It ran for three weeks and attracted attention from production companies worldwide (including the USA, Japan, Australia and Gulf Countries), resulting in the signing of a memorandum for an international tour in 2025-2026.

[43] To commemorate 50 years of diplomatic relations between Singapore and Mongolia, SingPost and Mongol Post launched a joint stamp issue in November 2020.

[45] The Embassy of Mongolia in Singapore organised a 2-month Mongolian cultural exhibition, Chrysanthemum Charm, at Gardens by the Bay in September 2023.