The first Republic of Lithuania was recognised by Switzerland in 1921. A consulate was opened in Kaunas, the country’s capital at the time. The Lithuanian diplomatic mission which had been set up in Bern in 1918 was attached to the embassy in Berlin.
Diplomatic relations between the two countries were interrupted in 1940 because of the Soviet annexation. Switzerland never recognised the annexation of Lithuania by the USSR. Diplomatic relations were immediately re-established after the failed Moscow putsch of August 1991.
The Swiss Embassy in Riga (Latvia) serves as the diplomatic representation of Switzerland in Lithuania, as well as Latvia and Estonia. Switzerland has an honorary consul in the Lithuanian capital, Vilnius. In 2024, Lithuania re-opened its Embassy in Bern.
Lithuania, Historical Dictionary of Switzerland (de, fr, it)
Diplomatic Documents of Switzerland, Dodis