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Organisers insist the decision isn't politically motivated.
Organisers of the London Pride parade, which is designed to unite people in support support of the lesbian, gay, bi-sexual and transgender (LGBT) community, are stopping the UK Independence Party from getting involved.
They insist it's too keep the event in the right spirit and isn't politically motivated.
In a statement, a spokesman for the organisers said: "We aim to unite our community, not divide it, and our intention is to serve the whole of our community with an inclusive event, so to exclude any group is not a decision we take lightly.
"For this year we have reached the decision that Ukip's application to join the Pride in London Parade, on June 27, will be turned down.
"This decision has been made after careful consultation in order to protect participants and ensure the event passes off safely and in the right spirit, it has not been made on a political basis.
"We appreciate many in our community have strongly held views about Ukip, their policies and comments, but is undeniable that there are LGBT members of Ukip, including their MEP for Scotland, and it is important to remember that Pride in London aims to be an inclusive event.
"However, of paramount concern to us is the experience of all participants at Pride, most especially the position we would be putting our volunteer stewards in."
In a mini-manifesto for Christians before last month's general election, Ukip said it'd give legal protection in the workplace to religious people who oppose same-sex marriage because of their beliefs.
Flo Lewis, the chair of LGBT in Ukip, said: "The board of London Pride 2015 have not decided to reject our application. Instead they have decided to rescind the invitation under threats from and complaints by other members of the LGBT community.
"We should, I think, be very sorry that this decision has been made, equally we are sorry that the organising committee and board of London Pride 2015 has been put under the sort of pressure it has over the past few days.
"All people, regardless of creed, colour or sexual orientation, can find a home in Ukip. It is a sad day for diversity and freedom when these people are prohibited from expressing their selves as part of the wider community."
The Party - which has LGBT members - has called it "a sad day for diversity and freedom".
The London Parade runs from Baker Street to Whitehall, via Oxford Street, Piccadilly Circus and Trafalgar Square on Saturday 27th June 2015.