Fifteen candidates will be fighting for the Peterborough seat vacated by disgraced MP Fiona Onasanya next week.
The by-election will take place on June 6, and was triggered when constituents signed a recall petition demanding Ms Onasanya's removal.
The independent MP was jailed for perverting the course of justice, and is the first-ever to be removed by the recall process, introduced by David Cameron in 2015.
Change UK have decided not to field a candidate.
So who are the candidates?
Brexit Party - Mike Greene
Mike Greene launches his campaign on a Brexit Party bus
Former businessman Mike Greene once appeared on the reality show Secret Millionaire.
He grew up in Peterborough and moved back to the area 20 years ago.
Mr Greene upset some locals last night, after parking his campaign van in a residents' only bay at a by-election hustings event.
Christian People's Alliance - Tom Rogers
Christian People's Alliance candidate Tom Rogers lives in Gunthorpe with his wife and four children.
The former English teacher has said he is against compulsory relationships and sex education, saying schools "should be places of education not state indoctrination".
He currently works as an education manager.
Common Good: Remain in the EU - Dick Rodgers
Dick Rodgers posts a selfie in Peterborough
Mr Rodgers is calling for a second EU referendum.
He says he is standing in the by-election because he wants to understand why "Peterborough voted 61 per cent to leave".
He has called the European Union a "tremendous peace project".
Conservatives - Paul Bristow
Paul Bristow with friend and fellow Conservative Jeremy Hunt on the campaign trail
At the start of his campaign to become the next MP for Peterborough, Mr Bristow knocked on the door of a known Conservative voter who said he would instead be voting for a Brexit Party candidate.
The moment was captured by Channel 4, and Mr Bristow began to walk off as the voter shouted: "When your party can put the 'Great' back into Britain I will come and vote for you again".
Fellow Conservatives Peter Bone and Jeremy Hunt have been snapped helping Mr Bristow on his campaign trail.
English Democrats - Stephen Goldspink
Goldspink runs his own project management business, and was a city councillor in Peterborough from 2002 to 2012.
He says he wants England to have its own Parliament "like Scotland, Wales and Northern Ireland".
Green Party - Joseph Wells
The Green Party's Natalie Bennett, centre, shares a selfie with Joseph Wells, right
The Green Party candidate says he has lived in Peterborough his "whole life" and has seen how the city has been "let down" by Westminster representatives.
"As climate change continues to pose a dire threat to the planet we are in desperate need of representatives who will look to the future," he told the BBC.
Independent - Andrew Moore
Andrew Moore speaking to the BBC
Peterborough resident and Brexiteer Andrew Moore is standing as an independent candidate.
A Twitter account under the name of Mr Moore, said the city needed an MP who cared about the area "warts and all".
Speaking to the BBC, he said: "I voted for Brexit. Brexit needs to be delivered. I'm Peterborough born and bred. We need to talk about Peterborough."
Independent - Bobby Smith
Mr Smith said he was 'wandering around' Peterborough taking selfies
Independent candidate Bobby Smith says he is standing in the by-election to "raise awareness of fathers' rights".
Posting a selfie on Twitter, Mr Smith captioned it: "While all the other Peterborough by election candidates (and the rest of the country) are getting worked up about #Brexit I'm just wandering around taking selfies.
"Who needs the stress of trying to get votes? Not me."
Labour - Lisa Forbes
The Labour candidate was pictured with Gordon Brown at the same time a by-election hustings took place
Lisa Forbes has lived in Peterborough for 30 years.
She stood for the seat back in 2015, but lost out to Tory MP Stewart Jackson.
Last night, Ms Forbes shunned a Peterborough by-election hustings to attend an event with former Prime Minister - and Jeremy Corbyn critic - Gordon Brown.
Liberal Democrats - Beki Sellick
Liberal Democrat candidate Beki Sellick is vehemently anti-Brexit.
The businesswoman told the BBC that the result of the Brexit referendum had resulted in a "spike in hate crimes".
She fought for the Peterborough seat back in the 2017 election.
Official Monster Raving Loony Party - Alan "Howling Laud" Hope
The Official Monster Raving Loony Party candidate will stand for 'things'
Candidate Alan Hope is also the leader of the Official Monster Raving Loony Party.
In a statement on the party website, Mr Hope said he intends to stand for "things".
"I intend to stand for ‘Things’. Things that need doing. Things that are good for the town. Things that can make Peterborough one great big happy community," he said.
Renew - Peter Ward
Mr Ward says he enjoys 'marathon-running'
The Renew candidate is a barrister specialising in anti-discrimination law.
He said disgraced MP Fiona Onasanya had shown "massive disprespect" to the people of Peterborough, and that they deserved a "better, honest representative".
He says his hobbies are "gardening and marathon-running".
SDP Fighting for Brexit - Patrick O'Flynn
Patrick O'Flynn describes himself as a 'common sense centrist'
Last year Mr O'Flynn left UKIP, claiming it had become an "impediment to Brexit campaigning".
He calls himself a "common sense centrist", and is an outgoing MEP for the SDP.
He wrote on Twitter: "Never forget that we are where we are because of Remainers.
"We have never had a pro-Leave Prime Minister. We have never had a pro-Leave chancellor. The losing side has been running the show throughout."
UK European Union Party - Pierre Kirk
Pierre Kirk campaigning in the run up to the EU elections
Pierre Kirk is the founder and leader of the UK European Union Party, which launched just before this year's EU elections.
He says he wants to "revoke Article 50", and told the New European: “We want to progress in the EU and grow as the EU grows.”
The eldest member of his party is 70-years-old, and the youngest is 23.
UKIP - John Whitby
UKIP candidate John Whitby
Former Cambridgeshire councillor John Whitby is standing as the UKIP candidate.
Tweeting about the upcoming by-election, he said: "It's going to be interesting and in a 60+% Leave voting area it should only be between real Brexiteers> Some of us fought for years to get this result, we don't want to let it go for nothing.
"UKIP for the working people, for the democrats and the Leave majority, I'm one of them!!".
Back in February, Mr Whitby was mocked for misspelling the word 'Britain' on a campaign leaflet calling for Fiona Onasanya to be removed from the Peterborough seat.
Instead, Mr Whitby wrote "Britians", which caught the attention of social media users.