There is a small community of Greeks in the Czech Republic. The Greek presence in Czech Republic is dated to the 20th century. Roughly 12,000 Greek citizens, mainly from Greek Macedonia in Northern Greece, who fled from the 1946-1949 Greek Civil War were settled in several formerly German inhabited areas in Czechoslovakia.
The admission of Greek Communist refugees to Czechoslovakia at the end of the 1946-49 Greek Civil War was facilitated by members of the Communist Party of Greece (KKE) living in exile in Bucharest, Romania. Though they initially expected that the refugees they would soon return to Greece, due to the development of the political situation they could predict no definite end to their stay in Czechoslovakia. As a result, many eventually naturalised as Czechoslovak citizens and generally assimilated, often intermarrying with local Czechs or the small but significant minority of Sudeten Germans allowed to remain in Czechoslovakia following its liberation from Nazi German occupation. In many cases, these Greek refugees were resettled in houses which had formerly been owned by Sudeten Germans and were left unoccupied following the expulsion of Germans from Czechoslovakia. Most were concentrated in or around the towns of Brno (Brünn in German), Ostrava, Opava, and Krnov (Jägendorf in German) in southern Silesia, where Greek farming expertise helped revive agricultural production on lands formerly worked by ethnic Germans. About 5,200 of the migrants consisted of unaccompanied children. The migrants were ethnically heterogeneous, consisting not just of Greek Macedonians, Pontic Greeks, and Caucasus Greeks, as well as Slav-Macedonians, but also Aromanians, Sephardi Jews, and even a few Turkish-speaking Greeks or Urums.
Beginning in 1975, shortly after the overthrow of the Colonels' dictatorship and a programme of political liberalisation in Greece which led to the legalisation of the KKE, several thousand young Greeks, including those born in Czechoslovakia, emigrated to Greece. Older Greeks followed them some years later, after an arrangement was made between the Greek and Czechoslovak governments for them to receive their pensions in Greece. By 1991, there were just 3,443 people in Czechoslovakia who declared Greek ethnicity; almost all of those were in the Czech portion of the country, with just 65 in the Slovak portion. However, many of those who did emigrate to (mainly northern) Greece continued to retain strong links with the Czech Republic, with a few even using their dual Greek-Czech national identitities and contacts to help establish trade links between the two countries.
In their early days in the Czechoslovak Socialist Republic, ethnic Greek Macedonian and Slav Macedonian migrants used Greek as their natural lingua franca; however in orphanages which housed unaccompanied child migrants, it was not uncommon for ethnic Greek children to become receptively bilingual in the Slav-Macedonian language spoken by their playmates. In later years, locally born members of the community showed increasing language shift towards Czech, and tended to have a somewhat weaker command of Greek. However, this may also have been a natural consequence of several factors, including: intermarriage with Czechs and Sudeten Germans, the communist Czechoslovak education system's emphasis on Russian as a second language at the expense of providing for minority-language education, and even the fact many ethnic Greek Macedonians residing in Czechoslovakia were actually Pontic Greeks and Caucasus Greeks and so somewhat more comfortable with the Pontic Greek dialect rather than the Standard (Demotic) Greek used by the majority of Greek speakers. In situations where families from these communities had ancestors originating in Southern Russia, as was the case with those defined as Caucasus Greeks, there had been a long tradition of using Russian as a second language after Pontic Greek anyway, but this was further reinforced in Soviet-dominated Czechoslovakia by the teaching of Russian in schools. Although a poor command of Modern Greek was previously often evident among the grandchildren of Greek refugees born in the 1980s and later, those from families who returned to Greece from the mid-70s have now been fully re-assimilated into Greek society and the Modern Greek education system. In fact, their multi-lingual background has enabled ethnic Greeks from Czechoslovakia (and elsewhere in the former Soviet Bloc) to develop and exploit a marked facility in foreign language learning and communication.
Except of the previous migration because of Greek Civil War, the next generation migration was caused by the Greek government-debt crisis on 2008. The also known as "Greek brain drain". From 2008 a minimum of 200.000 young educated people left from Greece to find a job in Europe & USA. The more desired countries were UK, Germany, the Netherlands, USA, and of course lot of people came also to the Czech Republic and Slovakia. The reason of choosing the Czech Republic and Slovakia is the foreign companies - mostly IT companies - that reside in those countries, companies like AT&T, IBM, RedHat and many more foreign or local companies that have many vacancies for IT people.