Protests against the global financial system which have seen huge demonstrations in New York's Wall Street are set to spread to the City of London.
A number of campaign organisations, including direct action group UK Uncut, say they will support an occupation of the heart of the capital's financial centre as part of a "global movement for real democracy" to highlight social and economic injustice.
The Occupy London Stock Exchange collective said a Facebook page on the protest had attracted more than 13,000 followers, with more than 5,000 confirmed attendees.
Laura Taylor, a supporter of the so-called OccupyLSX, said: "Why are we paying for a crisis the banks caused? More than a million people have lost their jobs and tens of thousands of homes have been repossessed, while small businesses are struggling to survive.
"Yet bankers continue to make billions in profit and pay themselves enormous bonuses, even after we bailed them out with £850 billion."
Another supporter, Kai Wargalla, said: "We want to make our voices heard against greed, corruption and for a democratic, just society. We stand in solidarity with Occupy Wall Street, protesters in Spain, Greece and the Middle East who started this movement. They have inspired people all over the world to step forward and make their voices heard."
UK Uncut supporter Peter Hodgson said: "The success of the square occupations across Spain in calling for democracy and an end to austerity, alongside the rapid growth of the Wall Street occupation, has shown that this is what is needed in London and the UK. The Government is ignoring its electorate as they impose these austerity measures."
OccupyLSX issued a statement which said: "The words corporate greed ring through the speeches and banners of protests across the globe.
"After huge bailouts and in the face of unemployment, privatisation and austerity, we still see profits for the rich on the increase. But we are the 99%, and on October 15 our voice unites across gender and race, across borders and continents, as we call for equality and justice for all.
"In London, we will occupy the Stock Exchange, reclaiming space in the face of the financial system and using it to voice ideas for how we can work towards a better future, a future free from austerity, growing inequality, unemployment, tax injustice and a political elite who ignores its citizens, and work towards concrete demands to be met."