| Harrien County | |
| Native Name: | Ревельскій уѣздъ |
| Native Name Lang: | ru |
| Settlement Type: | Uezd |
| Mapsize: | 225px |
| Subdivision Type: | Country |
| Subdivision Name: | Russian Empire |
| Subdivision Type1: | Governorate |
| Subdivision Name1: | Estonia |
| Established Title: | Established |
| Established Date: | 1745 |
| Extinct Title: | Abolished |
| Extinct Date: | 1920 |
| Seat Type: | Capital |
| Seat: | Reval |
| Area Total Km2: | 5713 |
| Population As Of: | 1897 |
| Population Total: | 157,736 |
| Population Density Km2: | auto |
Harrien County (de|Kreis Harrien or German: Kreis Reval, et|Harju kreis, ru|Ревельскій/Гарріенскій уѣздъ|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). Its capital was Reval (Tallinn), which was the capital of the governorate as well. The territory of Harrien County corresponds to present-day Harju County and most parts of Rapla County.[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.[3]