Eshtehard (; Tati: ) is a city in the Central District of Eshtehard County, Alborz province, Iran and serves as capital of the county.
At the time of the National Census of 2006, the population was 16,988 in 4,813 households, at which time it was a city in Karaj County, Tehran province. At the most recent census of 2016, the population was 29,993 in 9,357 households, by which time it had become the capital of Eshtehard County in the new Alborz province.
The majority of the people of Eshtehard belong to the Standard Persian and Persian Tat and Azerbaijani ethnic group and they speak the Tati language and Azerbaijani.
Main attractions include the Industrial Park of Eshtehard and the University of Payame Nur—Eshtehard Unit.