Hajipur Lok Sabha constituency is one of the 40 Lok Sabha constituencies in the eastern Indian state of Bihar.

Former Bihar Chief Minister Ram Sundar Das first contested from this seat in 1957 as a Socialist when he was 36 years old, and 57 years later in 2014 for Nitish Kumar's JD-U when he was 93.

From 1977 to 2019, this seat was dominated by Ram Vilas Paswan who won eight times from here and lost only twice, in 1984 and 2009.

In 2019 he vacated the seat for his younger brother Pashupati Kumar Paras.

Sitting PM Narasimha Rao secured 89.48% votes in 1991 but that was in a bye-poll, not General Election, for Nandyal seat.