Harrien County (German: Kreis Harrien or Kreis Reval, Estonian: Harju kreis, Russian: Ревельскій/Гарріенскій уѣздъ, romanized: Revelskiy/Garrienskiy uyezd) was one of the four counties of the Governorate of Estonia.

[1] It was situated in the central part of the governorate (in present-day northern Estonia).

[2] At the time of the Russian Empire Census of 1897, Harrien County had a population of 157,736.

Of these, 82.9% spoke Estonian, 7.3% German, 6.8% Russian, 0.7% Swedish, 0.7% Yiddish, 0.7% Polish, 0.2% Latvian, 0.2% Finnish, 0.1% Belarusian and 0.1% Ukrainian as their native language.

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