Nuit Blanche is an annual all-night or night-time arts festival of a city. The festival typically has museums, private and public art galleries, and other cultural institutions open and free of charge. The idea of a night-time festival of the arts has spread around the world, with events in over 120 cities, including Montreal, Ottawa, Toronto, Edmonton, Calgary, Halifax, Winnipeg, and Saskatoon in Canada, and several European capitals (Paris, Brussels, Rome, Madrid, Riga, Bucharest, and Valletta) which have chosen to pool their efforts as "Nuits Blanches Europe".

Nuit Blanche events usually feature contemporary art installations, exhibitions, concerts, and temporary installations scattered around the city. The festival invites Parisians and tourists to engage with works by national and international artists as they stroll around the city. The event is enjoyed by a huge number of Parisians who walk a circuit along which art installations are free to be seen by all.

Nuit Blanche was first organized in Paris in 2002 by the then Mayor, Bertrand Delanoë, as a festival of the arts and culture. Since then, the idea has spread to cities around the world. Torontos annual all-night celebration of contemporary art is produced by the City of Toronto in collaboration with local and international arts communities.