A Sadiq Khanblimp is set to be flown over London in protest at the giant Donald Trump baby balloon.
Organisers have raised more than £58,000 for the 29ft blimp as part of a campaign seeking to remove Mr Khan from his post.
The blimp depicts Mr Khan in a bikini and will fly over Parliament Square this weekend.
It is understood that the balloon will fly over Parliament Square on Saturday from 9.30am to 11.30am.
A Crowdfunder page that has been set up by Yanny Bruere, says: "In light of the Donald Trump 'Baby Trump' ballon being allowed to fly over London during his visit to the UK, let's get a 'baby Khan' one and see if free speech applies to all and whether or not Mr Khan and the London assembly will also approve this.
"Under Sadiq Khan, we have seen crime sky rocket to unprecedented levels. People in London don't feel safe and they aren't safe, 81 murders this year alone! Khan Out.
"Any surplus money raised will be used for a continuing campaign to remove Sadiq Khan from office and also for defending free speech which is constantly under attack."
Mr Khan defended the flying of a blimp of Mr Trump during the US President's visit to the UK.
A spokeswoman for the mayor said: "The City Hall 'city operations' team has spoken with the organisers of this balloon and given permission for them to use Parliament Square Garden.
"As always, City Hall has been working in very close co-ordination with the Metropolitan Police and other key agencies to ensure this protest is able to be carried out in a safe and secure way."
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