Old Ruthenian language may refer to:
- Old East Slavic, a language used in the 10th to 14th centuries by East Slavs in Kievan Rus', ancestor of Russian and Ruthenian (ancestor of Belarusian, Rusyn, and Ukrainian)
- Ruthenian language, a language used in the 15th to 18th centuries in the Grand Duchy of Lithuania and the Cossack state, ancestor of Belarusian, Rusyn, and Ukrainian
This disambiguation page lists articles associated with the title Old Ruthenian language.
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