Raiganj Lok Sabha constituency is one of the 543 parliamentary constituencies in India. The constituency centres on Raiganj in West Bengal. All the seven assembly segments of No. 5 Raiganj Lok Sabha constituency are in Uttar Dinajpur district.
A by-election was held in this constituency in 1972 which was necessitated by the resignation of sitting MP Siddhartha Shankar Ray and his subsequent election to the State Assembly from the Maldaha Assembly constituency. In the by-election, Maya Ray of Congress defeated his nearest rival S.K.Niyogi of United Front Supported Independent Candidate by 143,624 votes, thus breaking the record of Siddhartha Shankar Ray who had won the seat in 1971 by 64,007 votes.
Indian Parliamentary bye election, 1972: Raiganj constituency