| Name of the Candidate | Party Name | Results |
| BIJENDRA PRASAD YADAV | Janata Dal (United) | Won 82295 |
| KISHOR KUMAR | Bharatiya Janata Party | 44898 |
| SURESH KUMAR AZAD | Jai Hind Party | 5501 |
| MD. ZIYAUR RAHMAN | Bahujan Samaj Party | 4322 |
| BIJENDRA NARAYAN YADAV | Independent | 2907 |
| BHOGI MANDAL | Rashtravadi Janata Party | 1917 |
| ARVIND KUMAR SHARMA | Communist Party of India (Marxist-Leninist) (Liberation) | 1915 |
| JAY NARAYAN YADAV | Lok Sewa Dal | 1261 |
| PREM HANS KUMAR | Samajwadi Party | 1141 |
| None of the Above | None of the Above | 4309 |
| AC No | Category | Poll Phases | Last Date of Nominations | Date of Polls | Result |
| 43 | GEN | Phase V | Oct 8th 2015 | Nov 5th 2015 | Nov 8th 2015 |
Supaul asembly segment is a part of Supaul Lok Sabha constituency. It comprises of Marauna community development block, Parsarma Parsauni, Gopalpur Sire, Malhni, Bakaur, Chainsinghpatti, Ghuran, Bairiya, Pipra Khurd, Telwa, Ramdatt Patti, Sukhpur Solhni, Balwa, Bairo, Karnpur, Ekma, Laukha, Goth Baruari and Basbatti gram panchayats of Supaul CD block and Supaul municipality. The Supaul assembly segment has 2,45,712 eligible electors, out of which 1,27,942 are male and 1,17,762 are female.
One of the five assembly constituencies in the district of the same name in the state of Bihar, Supaul is currently represented by Bijendra Prasad Yadav of Janata Dal (United) who polled 55179 votes to defeat Ravindra Kumar Raman of Lalu Prasad Yadav's Rashtriya Janata Dal (RJD) by a margin of 15400 votes in the last assembly polls in 2010. In that election, while 55179 votes were polled in favour of Bijendra Prasad Yadav, who has been winning the seat since 1990, Ravindra Kumar Raman received 39779 votes.
Pramod Kumar Singh, who contested on the ticket of the Congress, came third with 14251 votes. Earlier current Bihar minister Bijendra Prasad Yadav has won the Supaul assembly seat in 1990, 1995, 2000, 2005 and 2010. In 1990 he had defeated the sitting Congress MLA Parmod Kumar Singh by a margin of 4256 votes. While Bijendra's wins in 1990 and 1995 came as a candidate of the Janata Dal, he won the remaining elections on the ticket of the JD (U).
Bijendra Prasad Yadav had won both the assembly elections to the seat in 2005. It is pertinent to note that Bihar went to the assembly polls twice in 2005 because the earlier one held in February threw hung assembly necessitating the holding of the second assembly polls in the month of November of the same year.
In the first assembly election to the Supaul assembly constituency held in 1951, veteran Congress leader and former Bihar minister Lahtan Choudhary emerged victorious from the seat. He was also the winner of the seat in a byepoll in 1958. Later he was elected for four times from Mahishi assembly constituency in Bihar. He was also Bihar Congress president.
Uma Shankar Singh had won the Supaul assembly seat in 1967, 1969, 1972 and 1980.
Supaul is one of the six assembly constituencies that combine to form the parliamentary constituency of the same name which is currently held by Ranjita Ranjan of the Congress who won the seat by defeating his nearest rival Dileshwar Kamait of the JD (U) in the 2014 Lok Sabha elections. Other assembly constituencies located in the Supaul Lok Sabha constituency are Nirmali, Pipra, Triveniganj, Chhatapur and Singheshwar.
Sitting MLA Bijendra Prasad Yadav from JD(U) will take on the NDA candidate here. While the NDA combine is yet to announce candidates for some of the constituencies, including in Supual segment, the JD(U) MLA is confident of getting support from voters across the age and class groups. In the assembly election of 2010, Yadav defeated RJD's Ravindra Kumar Raman by a margin of 15,400 votes. Bijendra Yadav got 55,179 votes as compared to Raman's 39,779. The Supaul assembly segment is in Supaul district.