Amid tight security, the polling in Bihar was conducted in two phases on November 6 (121 constituencies) and November 11 (122 constituencies).The Rashtriya Janata Dal (RJD), the Janata Dal United (JDU), the Bharatiya Janata Party (BJP), and the Congress are the main parties in the state. The National Democratic Alliance (NDA), led by the Bharatiya Janata Party (BJP), is in alliance with the Janata Dal United (JDU), Lok Janshakti Party (Ram Vilas), Hindustani Awam Morcha (HAM), and Rashtriya Lok Morcha (RLM), while the Congress is in alliance with the Rashtriya Janata Dal (RJD), Left parties, and Vikassheel Insaan Party (VIP) in Bihar.
West Champaran district
| Constituency No | Constituency name | Winners | Party |
| 1 |
Valmiki Nagar |
SURENDRA PRASAD |
Congress |
| 2 |
Ramnagar |
NAND KISHOR RAM |
BJP |
| 3 |
Narkatiaganj |
SANJAY KUMAR PANDEY |
BJP |
| 4 |
Bagaha |
RAM SINGH |
BJP |
| 5 |
Lauriya |
VINAY BIHARI |
BJP |
| 6 |
Nautan |
NARAYAN PRASAD |
BJP |
| 7 |
Chanpatia |
ABHISHEK RANJAN |
Congress |
| 8 |
Bettiah |
RENU DEVI |
BJP |
| 9 |
Sikta |
SAMMRIDH VARMA |
JDU |
East Champaran district
| Constituency No | Constituency Name | Leading candidate/ winners | Party |
| 10 |
Raxaul |
PRAMOD KUMAR SINHA |
BJP |
| 11 |
Sugauli |
RAJESH KUMAR ALIAS BABLU GUPTA |
LJP |
| 12 |
Narkatiya |
VISHAL KUMAR |
JDU |
| 13 |
Harsidhi |
KRISHNANANDAN PASWAN |
BJP |
| 14 |
Govindganj |
RAJU TIWARI |
LJP |
| 15 |
Kesaria |
SHALINI MISHRA |
JDU |
| 16 |
Kalyanpur |
MAHESHWAR HAZARI |
JDU |
| 17 |
Pipra |
SHYAM BABU PRASAD YADAV |
BJP |
| 18 |
Madhuban |
RANA RANDHIR |
BJP |
| 19 |
Motihari |
PRAMOD KUMAR |
BJP |
| 20 |
Chiraia |
LAL BABU PRASAD GUPTA |
BJP |
| 21 |
Dhaka |
PAWAN KUMAR JAISWAL |
BJP |
