Voters will go to the polls on Thursday 9 November to select a new Mayor of Hackney, the council has announced.
Two parties have so far announced their candidates.
Dalston councillor Zoë Garbett is running for the Greens after taking second place in last year’s Hackney mayoral election.
Garbett is also the party’s candidate for the London mayoral election next year.
She wants a referendum over the future of the role of directly elected Mayor of Hackney.
Labour’s candidate is Caroline Woodley, who is the cabinet member for families, parks and leisure.
She has vowed to “rebuild trust” with residents following the resignation of former mayor Philip Glanville.
Glanville was photographed at a party with newly elected councillor Tom Dewey hours after he was told that Dewey had been arrested by the National Crime Agency.
He had previously said he had not spoken to Dewey after learning of the arrest.
Dewey was handed a 12-month suspended sentence in August after admitting five charges of possessing indecent images of children.
The count for the upcoming by-election will be held on Friday 10 November.
Would-be candidates have until Friday 13 October to submit their nomination papers.
Residents, including those who have just moved into Hackney, need to act fast to register to vote.
They must apply by midnight on Tuesday 24 October.
Applications for postal votes must be made by 5pm on Wednesday 25 October.
Voters will also need photo ID – the first time it will be used in an election in Hackney.
People without approved photo ID, such as a passport or driving licence, can apply for a voter authority certificate.