Elections to the Mysore Legislative Assembly were held on 25 February 1957.

589 candidates contested for the 208 seats of the 179 constituencies in the Assembly.

On 1 November 1956, Mysore state was enlarged by the addition of Coorg State, the Kollegal taluk of the Coimbatore district and the South Kanara district (except the Kasaragod taluk) of Madras State, the districts of Raichur and Gulbarga from western Hyderabad State and the Kannada speaking districts of Dharwar, Bijapur, North Kanara, and Belgaum, (except the Chandgad taluk of Belgaum district) from southern Bombay State under States Reorganisation Act, 1956.

Total electors in the state were 100,06,931 and the electors who were entitled to vote were 1,25,15,312 (including two-member constituencies).

39,59,518 electors voted in single-member constituency while 24,60,641 electors cast their vote in double-member constituencies.