Elections to the Uttar Pradesh Legislative Assembly were held in June 1977 to elect members of the 425 constituencies in Uttar Pradesh, India. The Janata Party won a majority of seats and Ram Naresh Yadav was appointed the Chief Minister of Uttar Pradesh. The number of constituencies was set as 425 by the recommendation of the Delimitation Commission of India.

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.