1981
Opening of the Embassy of Sri Lanka in Riyadh, Saudi Arabia.
1982
First UNESCO World Heritage Sites in Sri Lanka
First UNESCO World Heritage Sites in Sri Lanka

3 Cultural sites in Sri Lanka are inscribed on the UNESCO World Heritage List: The Ancient City of Polonnaruwa, the Ancient City of Sigiriya, and the Sacred City of Anuradhapura.

Today, there are 6 cultural sites inscribed on the UNESCO Heritage List, including the Golden Temple of Dambulla (1991), the Old Town of Galle and its Fortifications (1988), and the Sacred City of Kandy (1988). UNESCO has also listed 2 natural sites on the World Heritage List: the Central Highlands of Sri Lanka (2010) and the Sinharaja Forest Reserve (1988).

1982
Opening of the Embassy of Sri Lanka in Kuwait.
1983
Opening of the Consulate General of Sri Lanka in Mumbai, India.
1985
South Asian Association for Regional Cooperation (SAARC) established
South Asian Association for Regional Cooperation (SAARC) established

The South Asian Association for Regional Cooperation (SAARC) established with the signing of the SAARC Charter in Dhaka on 8 December 1985 with 7 members. Sri Lanka is a founding member.

1987
Opening of the Embassy of Sri Lanka in Havana, Cuba.
1987
Opening of the Embassy of Sri Lanka in Seoul, Korea.
1987
Opening of the Embassy of Sri Lanka in Muscat, Oman.
1990
Opening of the Embassy of Sri Lanka in Tehran, Iran.
1992
 Establishment of Diplomatic Relations with the Netherlands
Establishment of Diplomatic Relations with the Netherlands

Diplomatic Relations with the Netherlands established in November 1992.

1993
Opening of the Embassy of Sri Lanka in The Hague, Netherlands.
1993
Opening of the Consulate General of Sri Lanka in Dubai, United Arab Emirates