Zarasai County (Russian: Новоалександровский уезд, Lithuanian: Zarasų apskritis, Lithuanian: Novoaleksandrovsko apskritis ) was one of the counties of the Russian Empire.

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Established 1795 under Vilna Governorate. Transferred to Kovno Governorate in 1843. Formal abolition in 1924 by Soviet authorities.

At the time of the Russian Empire Census of 1897, Zarasai County had a population of 208,487. Of these, 49.8% spoke Lithuanian, 16.8% Belarusian, 12.7% Yiddish, 9.9% Russian, 8.9% Polish, 1.8% Latvian and 0.1% German as their native language.^[1]