The by-election to two constituencies - Brahmanbaria-1 (Nasirnagar) and Gaibandha-1 (Sundarganj) began at 8.00am and will continue till 4.00pm on Tuesday.
Brahmanbaria-1 seat fell vacant due to death of its lawmaker veteran Awami League leader and Fisheries and Livestock Minister Sayedul Hoque.
Three candidates - Awami League nominated candidate Farhad Hossain Sangram, Jatiya Party (Manju) contender Rezwan Ahmed and Islami Oikya Jote contestant Abul Qasem are vying for becoming parliament member from the constituency. A total of 2,14,009 people are eligible to cast their votes.
Gaibandha-1 constituency fell vacant as its lawmaker Awami League leader Golam Mostafa Ahmed passed away on December 19 last.
Four candidates - AL nominated candidate Afruja Bari, sister of lawmaker Manjurul Islam Liton, Jatiya Party (Ershad) contestant Barrister Shamim Haider Patwary, National People's Party (NPP) contender Zia Jaman and Gono Front candidate Md Shariful Islam - are contesting in the polls.
As many as 3,38,000 people are eligible voters to cast their votes at 109 centres.