Jaynagar Assembly constituency is a Legislative Assembly constituency of the South 24 Parganas district in the Indian State of West Bengal.

Debaparasad Sarkar of SUCI(C) has represented the Jaynagar Assembly constituency from 1977 to 2006.

Jnantosh Chakraborty of INC won the Jaynagar Uttar seat and Anadi Mohan Tanti of INC won the Jaynagar Dakshin seat.

In 1957,[3] Subodh Banerjee and Renupada Halder, both of SUCI(C), won.

In 1952, Subodh Banerjee and Dinataran Moni, both of SUCI(C), won.