The by-election to the Tangail-4 (Kalihati) constituency will be held today.
The contestants are Awami League candidate Hasan Imam Khan (boat symbol), Ataur Rahman Khan of Bangladesh Nationalist Front (television symbol) and Imrul Kayes of National People's Party (mango symbol).
All preparations, including sending election materials to the centres, are complete to hold the election peacefully, said Mohammad Tajul Islam, assistant returning officer.
Some 1325 policemen, 1498 Ansar members, 25 executive magistrates, two judicial magistrates, 25 mobile teams and eight striking forces of the law enforcers will work to maintain law and order in the election, he added.
There are 3,07,700 voters in the constituency, of them, 1,52,833 are male and 1,54,867 female.
The constituency fell vacant following the resignation of lawmaker Abdul Latif Siddique, also a sacked minister, in September 2015.
On September 15, the Election Commission (EC) announced the schedule to hold the by-polls on October 28 that year.
But the by-election was suspended due to legal complexity over the validity of the candidacy of Krishak Shramik Janata League President Abdul Kader Siddique.
However, all legal complexities were cleared as the Supreme Court on January 18 this year upheld the cancellation of his nomination and the EC on January 24 decided to proceed with the by-polls.