Erast Georgievich Hiatsintov (Russian: ????? ?????????? ?????????; 10 November 1858 – 7 April 1910) was a Russian-Estonian politician who was the mayor of Reval (now Tallinn) in from February 1905 to December of that year, notably becoming the first person of Russian descent to become the mayor of Reval.
Consequently, he was also the first person of non-Baltic German descent to become mayor, the culmination of an Estonian-Russian political alliance, created by future Estonian president Konstantin Päts and Jaan Poska that broke the power that Baltic Germans had in the political system of the city for centuries.