Kačinskas, the ministry's political director, will take the office on January 23, replacing Alfonsas Eidintas who started his term in Athens in 2014 and will end the tenure on January 4.
Kačinskas, 45, has held various positions at Lithuania's embassies to the United States and the United Kingdom, as well as posts at the Foreign Ministry's departments and divisions.
The diplomat served as plenipotentiary minister at the Lithuanian embassy to the US between 2010 and 2014 and took up his current position as political director at the Foreign Ministry two years ago.
Lithuanian ambassadors are appointed and dismissed by the president on the government's recommendation and subject to approval from the parliament's Foreign Affairs Committee.
Greece, a member of the European Union and NATO, is deep in debt after the last economic and financial crisis. EU has helped Greece to cover the debts in exchange for Athens' commitment to strict fiscal discipline.
Greece has also been strongly affected by the migration crisis.
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