Awami League Parliamentary Board (ALPB) nominated Jebunnesa Afroz for contesting in the Barisal-5 constituency by-polls.
Jebunnesa is the wife of ruling party lawmaker Shawkat Hossain Hiron, also former mayor of Barisal City Corporation, who died recently.
At a parliamentary board meeting chaired by party chief Sheikh Hasina, also the prime minister finalised the nomination after reviewing several applications for nomination, a parliamentary board member told The Daily Star.
The meeting was held at Prime Minister's official residence at Gono Bhaban.
The constituency fell vacant as its lawmaker Hiron died on April 9. The election will be held on June 12.