The emergence and development of Old Church Slavonic is connected above all with the Greek language and tradition, inasmuch as most translations were made from Greek originals. However, other languages also occupied an important place in the formative stages of Old Church Slavonic, most notably Latin and Old High German. On the basis of both old and new data, the author not only endeavors to assess the relevance of their influence on Old Church Slavonic, but also places attention on the role to be assigned in this process to the contemporary Slavic dialects.