The elections are the country's third parliamentary elections in 2021, with no party able to form a government after elections in April and July.
The 240 members of the National Assembly are elected by open list proportional representation from 31 multi-member constituencies ranging in size from 4 to 16 seats. The electoral threshold is 4% for parties, with seats allocated according to the largest remainder method
A second round of the presidential elections will be held on 21 November if no candidate receives a majority of the vote in the first round. Incumbent president Rumen Radev is eligible and running for re-election.