Omeljan Pritsak (7 April 1919, Luka, Sambir County, eastern Galicia – 29 May 2006, Boston, Massachusetts, U.S.) was the first Mykhailo Hrushevsky Professor of Ukrainian History at Harvard University and the founder and first director (1973-1989) of the Harvard Ukrainian Research Institute.

Pritsak began his academic career at the University of Lviv in interwar Poland where he studied Middle Eastern languages under local orientalists and became associated with the Shevchenko Scientific Society and attended its seminar on Ukrainian history led by Ivan Krypiakevych. After the Soviet annexation of Galicia, he moved to Kyiv where he briefly studied with the premier Ukrainian orientalist, Ahatanhel Krymsky. During the war, Pritsak escaped to the west. He studied at the universities in Berlin and Göttingen, receiving a doctorate from the latter, before teaching at the University of Hamburg. In the 1960s, he moved to the United States, where he taught at the University of Washington for a while, before moving to Harvard at the invitation of the prominent linguist, Roman Jakobson, who was interested in proving the authenticity of the twelfth century "Song of Igor" through the use of oriental sources. At Harvard, he founded the Harvard Ukrainian Research Institute (1973), became the first Mykhailo Hrushevsky Professor of Ukrainian History (1975), and started the journal, Harvard Ukrainian Studies (1977ff). In 1989, he retired from his Harvard professorship. After the emergence of an independent Ukraine in 1991, Pritsak returned to Kyiv where he founded the Oriental Institute of the National Academy of Sciences and the journal Skhidnyi svit (The Oriental World). He spent his final years back in the United States, and died in Boston at the age of 87.

Ashkenazi Jews, also known as Ashkenazic Jews or Ashkenazim (Hebrew: אַשְׁכֲּנָזִים‎‎, pronounced [ˌaʃkəˈnazim], singular: [ˌaʃkəˈnazi]; also יְהוּדֵי אַשְׁכֲּנָז, Y'hudey Ashkenaz, "the Jews of Ashkenaz"), are the Jews descended from the medieval Jewish communities along the Rhine in Germany from Alsace in the south to the Rhineland in the north.^{[citation needed]}

The name Ashkenazi derives from the bibilical figure of Ashkenaz, the first son of Gomer, and a Japhetic patriarch in the Table of Nations (Genesis 10). In the Rabbinic literature, Ashkenaz's kingdom was first associated with the Scythian region, then later on with the Slavic territories, and from the 11th century onwards with Northern Europe and Germany. The Jews living in the northern regions, associated with Ashkenaz's kingdom, thus came to call themselves the Ashkenazi Jews. Later, Jews from Western and Central Europe also came to be called "Ashkenazi" because the main centers of Jewish learning were located in Germany.

Many Ashkenazi Jews later migrated, largely eastward, forming communities in non German-speaking areas, including Bohemia, Hungary, Poland, Belarus, Lithuania, Russia, Ukraine, Romania, and elsewhere between the 11th and 19th centuries. With them, they took and diversified Yiddish, a High German language written using the Hebrew alphabet. It had developed in medieval times as the lingua franca among Ashkenazi Jews. The Jewish communities of three cities along the Rhine: Speyer, Worms and Mainz, created the SHUM league (SHUM after the first Hebrew letters of Shpira, Vermayza, and Magentza). The ShUM-cities are considered the cradle of the distinct Ashkenazi culture and liturgy.