Republic CEO Graham Smith spoke to Express.co.uk after Scottish First Minister Nicola Sturgeon made the announcement that she would seek permission from the Government to hold a second Scottish referendum.
The anti-monarchist blasted the Queen as the UK’s head of state and claimed she actually divided the country instead.
He said: “I think part of the problem with the monarchy is that the claim she unifies the country is a huge myth, it’s actually the opposite of the truth.
“We’ve been quite a divided country for quite a long time. A small part of it, Northern Ireland, was mired in political violence for a long time and the crown was symbolic with one half of that.
Republic's Graham Smith said the monarch did not unify the UK
I’ve never heard a good reason for keeping the monarchy, I can’t think of a single one
“In Scotland, there’s quite a lot of anti-monarchy feeling but what you also have is a monarch who is always English, she’s always white, she’s always Church of England, religious, she doesn’t represent anybody really in the country.”
Mr Smith said the British people should be able to choose their own head of state.
He said: I think that a republic would at least give everybody in the country, wherever they are, an equal vote to take part in choosing who their head of state is going to be.
“And that could be someone who’s Scottish, someone who’s English, Welsh, Irish, whoever.”
Queen Elizabeth II in pictures Thu, March 16, 2017
Queen Elizabeth II making her Royal visits in her many colourful and elegant outfits.
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The Queen departs the National Army Museum in Chelsea, London, Britain, 16 March 2017.
Members of the royal family celebrating the Queen's 90th birthday
He then rebuked the royal family, claiming he could not think of a “single reason” for keeping the monarchy going.
Mr Graham said: “I’ve never heard a good reason for keeping the monarchy, I can’t think of a single one.
“There’s plenty of myth around it, people say that everyone likes it and that’s not true – most people don’t care. People say it’s good for the economy, which also isn’t true, there’s no evidence.
“People say that the Queen keeps power away from politicians and the opposite is true, there’s a lot of power in the hands of the Prime Minister.
“People might enjoy it on the day of a wedding or a jubilee but I think that’s a pretty flimsy argument for what is our head of state.”
The comments come despite a recent YouGov poll revealed 68 per cent of participants believed the monarchy was good for the country.
Queen Elizabeth II became the UK’s longest-reigning monarch in 2015 and has now been head of state for 65 years.