Karsunsky Uyezd (Карсунский уезд) was one of the subdivisions of the Simbirsk Governorate of the Russian Empire.
It was situated in the western part of the governorate.
[1] At the time of the Russian Empire Census of 1897, Karsunsky Uyezd had a population of 217,087.
Of these, 85.3% spoke Russian, 8.3% Mordvin, 3.9% Tatar, 2.3% Chuvash, 0.1% German and 0.1% Estonian as their native language.
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