Karhal Assembly constituency is one of the 403 constituencies of the Uttar Pradesh Legislative Assembly, India. It is a part of the Mainpuri district and one of the five assembly constituencies in the Mainpuri Lok Sabha constituency. First election in this assembly constituency was held in 1957 after the "DPACO (1956)" was passed in 1956. After the "Delimitation of Parliamentary and Assembly Constituencies Order" was passed in 2008, the constituency was assigned identification number 110.

The Uttar Pradesh Legislative Assembly, also known as Uttar Pradesh Vidhan Sabha, is the lower house of the bicameral legislature of Uttar Pradesh. There are 403 seats in the house. Members of the Assembly are elected by an adult universal suffrage and a first-past-the-post system to represent their respective constituencies, and they hold their seats for five years or until the body is dissolved by the Governor on the advice of the council of ministers. The house meets in the Vidhan Sabha Chambers of the Vidhan Bhavan, Lucknow.