Mongolia's embassy in Sofia, the Republic of Bulgaria, concurrently accredited to Cyprus, Greece, Moldova, North Macedonia and Romania. Mongolia's diplomatic missions abroad list records the post at 52 Frederic Joliot Curie, Sofia-1113, with L.Sayanaa as chief of mission (Consul.mn, diplomatic missions abroad list, dated 1 September 2024). Reporting gives the holder's full name as Lkhagvasuren Sayanaa (also rendered Sayanaa Lkhagvasuren), Ambassador of Mongolia to Bulgaria, in post in Bulgarian foreign ministry reporting of 20 March 2026 (Ministry of Foreign Affairs of Bulgaria, 20 March 2026).
Mongolia and Bulgaria established diplomatic relations on 22 April 1950 (Bulgaria-Mongolia relations). The two countries marked the 75th anniversary of diplomatic relations in 2025, noted at the Bulgarian foreign ministry meeting of 20 March 2026, which also recorded an upward trend in high-level political dialogue, active interparliamentary exchanges and a steady annual increase in Mongolian students studying in Bulgaria (Ministry of Foreign Affairs of Bulgaria, 20 March 2026).