Trump, who will be sworn in as the 45th president of the United States later today, faces protests in Washington during his inauguration, and in cities from Toronto to Sydney, Addis Ababa and Dublin over his politics which critics say are divisive and dangerous.
The protest in London was organized by the campaign group also called "Bridges not Walls", in reference to Trump's pledge to build a wall on the Mexican border, Reuters repoted.
"We won't let the politics of hate peddled by the likes of Donald Trump take hold," Nona Hurkmans of Bridges not Walls said in a statement.