The Independent National Electoral Commission (INEC) has postponed all the bye-elections in 11 states.
In a statement on Thursday, Festus Okoye, INEC spokesman, said the 15 bye-elections have been put on hold as a result of the current security situation.
The elections, for six senatorial districts and nine state constituencies, were scheduled to hold on October 31.
Protests against police brutality under the #EndSARS movement had turned violent resulting in several deaths across the country.