Some City of London facilities with LED lights will be lit in the colours of the French flag for the next three nights.
Mayor Matt Brown says it is to show support to the people of Paris following the deadly terrorist attacks Friday.
City hall will be lit in red, white and blue and and the Canadian flag there will be at half-mast.
“We do this as a sign of solidarity, sympathy and support with the people of France in the wake of the heinous terrorist attacks Friday night,” the mayor said.
”I join all Londoners in condemning these cowardly acts. We stand united in our grief for those killed and injured and our thoughts and prayers are with all of those affected by these attacks.”
France has declared three days of national mourning after the terrorist attacks killed more than 100 people.
Among those city facilities to display or cycle through the blue, white and red colours of the French flag will be the J. Allen Taylor building on Dundas Street. The Blackburn Memorial Fountain will be lit in white.