The West Bengal state assembly election of 1957 was part of a series of state assembly elections in 1957.

On 1 November 1956, under States Reorganisation Act, 1956, a portion of the Purnea district east of the river Mahananda and the Purulia sub-district of the Manbhum district in the south (except Char Thana) were transferred from Bihar to West Bengal.

On the political left two alliances had emerged; the United Left Election Committee (an alliance between CPI, PSP, AIFB, MFB and RSP) and the United Left Front (comprising the SUCI(C), the BPI, the RPI and the Democratic Vanguard).

A third alliance was the United Democratic People's Front, consisting of BJS, Hindu Mahasabha and RCPI.

[2] The election was won by the Indian National Congress, who got a majority of its own in the assembly.