The Tricolore lit Preston’s iconic Harris Museum and Art Gallery on Friday night in memory of the Nice terror attack victims.
Advertisement84 people died in the Bastille Day incident where a lorry was driven into crowds watching a display.
Preston City Council chose to light the landmark as a mark of respect and sign of solidarity with Nice. The Union flag has also been flying at half mast above the Town Hall.
Cabinet member for culture and leisure councillor Peter Kelly said: “It’s a shocking attack on innocent people enjoying a night out with their families.
“The City Of Preston with its historic twinning, cultural and other ties has a long history of working together with France.
“This is a simple gesture of our solidarity and sympathy with the people of France at this difficult time.”
Lovely tribute to the victims of the #NiceAttack from @TheBplTower. ???? pic.twitter.com/vx8otqQ8d2
— BBC Lancashire (@BBCLancashire) July 15, 2016
Across Lancashire a number of landmarks have been lit with the French flag’s colours, including Blackpool Tower.