सिवान जिले में दो लोक सभा निर्वाचन एक सिवान और दूसरा महराजगंज है | भारत के संविधान के अनुसार लोक सभा का गठन वयस्क मतदान के आधार पर प्रत्यक्ष चुनाव द्वारा चुने गए जनता के प्रतिनिधियों से होता है।
सिवान जिले के अभी तक निर्वाचित सभी सांसद की लिस्ट इस प्रकार है :
सिवान जिले के अभी तक निर्वाचित सभी सांसद :
- 1957: Jhulan Singh, Indian National Congress
- 1962: Mohammad Yusuf, Indian National Congress
- 1967: Mohammad Yusuf, Indian National Congress
- 1971: Mohammad Yusuf, Indian National Congress
- 1977: Mirtanjay Prasad Verma, Bharatiya Lok Dal
- 1980: Mohammad Yusuf, Indian National Congress (I)
- 1984: Abdul Ghafoor, Indian National Congress
- 1989: Janardan Tiwari, Bharatiya Janata Party
- 1991: Brishin Patel, Janata Dal
- 1996: Mohammad Shahabuddin, Janata Dal
- 1998: Mohammad Shahabuddin, Rashtriya Janata Dal
- 1999: Mohammad Shahabuddin, Rashtriya Janata Dal
- 2004: Mohammad Shahabuddin, Rashtriya Janata Dal
- 2009: Om Prakash Yadav, Independent
- 2014: Om Prakash Yadav, Bharatiya Janata Party
- 2019: Kavita Singh, Janata Dal United(JDU)
महराजगंज के अभी तक निर्वाचित सभी सांसद :
- 1957: Mahendra Nath Singh, Indian National Congress
- 1962: Nagendra Nath Singh, Indian National Congress
- 1980: Krishan Pratap Singh, Indian National Congress
- 1984: Krishan Pratap Singh, Indian National Congress
- 1989: Chandrasekhar Singh, Janata Dal
- 1989: Ram Bahadur Singh, Janata Dal
- 1991: Girija Devi, Janata Dal
- 1996: Ram Bahadur Singh, Samajwadi Janata Party (Rashtriya)
- 1998: Prabhunath Singh, Janata Dal (United)
- 1999: Prabhunath Singh, Janata Dal (United)
- 2004: Prabhunath Singh, Janata Dal (United)
- 2009: Uma Shankar Singh, Rashtriya Janata Dal
- 2013: Prabhunath Singh, Rashtriya Janata Dal
- 2014: Janardan Singh Sigriwal, Bharatiya Janata Party
- 2019: Janardan Singh Sigriwal, Bharatiya Janata Party