Birajit Sinha is the state president of Indian National Congress and a well known politician from Tripura, India representing Kailashahar as an MLA for 6th term in Tripura Legislative Assembly Birajit Sinha joined student politics at the age of 17 in 1969, and has been an active member of Indian National Congress since 1972.

In 2003 Legislative Assembly elections he was the State Congress President and the chief ministerial candidate of INC where he was re-elected from his seat but the party couldn't get the majority.

In 2023 Legislative Assembly elections he contested from Kailashahar and won with 9686 votes against BJP rival securing the highest margin ever recorded from the constituency.

He is the Founder President of ASHRAY – a registered social voluntary organisation working on the program areas of healthcare, welfare and national development.

He was awarded the Rashtriya Ekta Puraskar in 2000 for outstanding contributions to communal harmony in Tripura.