By-elections to three constituencies, including Dhaka-10, will be held on March 21.
Dhaka-10 fell vacant on December 27, after mayor-elect Sheikh Fazle Noor Taposh resigned as lawmaker to contest the Dhaka city polls.
The other two constituencies are: Gaibandha-3 and Bagerhat-4.
Gaibandha-3 and Bagerhat-4 went vacant on December 29 and January 10, following deaths of Awami League lawmakers Yunus Ali Sarker and Md Mozammel Hossain respectively.
Election Commission Secretary Md Alamgir announced the by-polls schedule after a meeting at the commission yesterday.
Of the three, electronic voting machines (EVM) will be used in the by-polls to Dhaka-10 while the rest will be held with traditional ballot boxes.
The last date for submitting nomination papers is February 19 and last date for withdrawal of candidacy is February 29.
The EC will scrutinise nomination papers on February 23.
According to the constitution, it is mandatory to hold by-polls to elect a new public representative within 90 days after a constituency falls vacant.