The Haryana Legislative Assembly (Hindi: Haryana Vidhan Sabha) is the unicameral legislature of Indian state of Haryana. The seating of the assembly is at Chandigarh, the capital of the state. There are 90 seats in the house filled by direct election using a single-member first-past-the-post system. The term of office is five years.^[2]

The body was founded in 1966, when the state was created from part of the state of Punjab, by the Punjab Reorganisation Act, 1966. The house initially had 54 seats, ten reserved for scheduled castes, this was increased to 81 seats in March 1967, and to 90 seats (including 17 reserved seats) in 1977.^[3] Highest number of seats ever won was in 1977 when Janata Party won 75 out of 90 seats when in the aftermath of 1975–77 emergency by Indian National Congress's (INC) Indira Gandhi. INC won only 3 seats, Vishal Haryana Party and independents both won 5 seats each.^[4]

Since the formation of Haryana in 1966, the state politics became infamously dominated by the nepotistic clans of 5 political dynasts, Lal trio (Devi Lal, Bansi Lal and Bhajan Lal) as well as the Hooda clan and Rao Birender clan.^[5][6] The infamous Aaya Ram Gaya Ram politics, named after Gaya Lal in 1967, of frequent floor-crossing, turncoating, switching parties and political horse trading within short span of time became associated with Haryana.^{[7][8][9][10]}

• Aaya Ram Gaya Ram
• Dynastic politics of Haryana
• Elections in Haryana