Hilandar Research Library (HRL) at the Ohio State University has the world’s largest collection of medieval Slavic Cyrillic manuscripts on microform.

HRL is associated with Ohio State's Resource Center for Medieval Slavic Studies (RCMSS) and the department of Slavic and East European Languages and Cultures (SEELC), which together co-sponsor the Medieval Slavic Summer Institute every other year for qualified graduate students.

Hilandar Research Library houses microform (predominately microfilm) collections of Slavic, primarily Cyrillic, manuscripts from numerous repositories in dozens of countries. Various other languages, scripts and cultures are also represented, including over a hundred Greek manuscripts on microfilm from Hilandar Monastery. Related material supplements the manuscript collection. Among the collections are

• Microfilms of the Slavic manuscript library of Hilandar Monastery and portions of several other monastic collections on Mount Athos
• 700+ early Slavic imprints on microform
• A 10,000 volume reference collection
• Over 45 original Cyrillic manuscripts and early printed books
• Mount Athos slide collection
• Steven Enich Serbian Orthodox Culture Slide collection
• Much of the personal library and archives of the 20th-century iconographer, Pimen Maksimovich Sofronov