Bulgaria originally established diplomatic ties with Czechoslovakia in 1920.

[1] Slovakia declared independence from Czechoslovakia in 1993, and was briefly independent during World War II as the Slovak Republic (1939-1945).

Bulgaria and Slovakia established diplomatic relations for the first time between 1939 and 1945.

Both countries re-established diplomatic relations on January 1, 1993.

Both countries are full members of the European Union and NATO.