Yevanic, also known as Judaeo-Greek, Romaniyot, Romaniote, and Yevanitika, is a Greek dialect formerly used by the Romaniotes and by the Constantinopolitan Karaites (in whose case the language is called Karaitika or Karaeo-Greek). The Romaniotes are a group of Greek Jews whose presence in the Levant is documented since the Byzantine period. Its linguistic lineage stems from the Jewish Koine spoken primarily by Hellenistic Jews throughout the region, and includes Hebrew and Aramaic elements. It was mutually intelligible with the Greek dialects of the Christian population. The Romaniotes used the Hebrew alphabet to write Greek and Yevanic texts. Judaeo-Greek has had in its history different spoken variants depending on different eras, geographical and sociocultural backgrounds. The oldest Modern Greek text was found in the Cairo Geniza and is actually a Jewish translation of the Book of Ecclesiastes (Kohelet).
The term Yevanic is an artificial creation from the Biblical word יון () referring to the Greeks and the lands that the Greeks inhabited. The term is an overextension of the Greek word Ἰωνία (Ionia in English) from the (then) easternmost Greeks to all Greeks. The word for Greece in modern Israeli Hebrew is ; likewise, the word is used to refer to the modern Greek language in Hebrew.
A small number of Romaniote Jews in the United States, Israel, Greece, and Turkey have some knowledge of the Judaeo-Greek language. The language is highly endangered and could completely die out. There are no preservation programs to promote or to revive the language, but starting in April, 2022, the Oxford School for Rare Jewish languages will be offering a beginner's course. In 1987, there were 35 speakers left in Israel, the majority located in Jerusalem. This population may have died out.
a few elderly Jews in Ioannina, Greece still speak the language.
Greece, Constantinople, Asia Minor, Southern Italy, the Balkans and Eastern Europe had originally a Greek-speaking Jewish community.