Toulon (UK: , US: , French: [tulɔ̃]; Provençal: Tolon (classical norm), Touloun (Mistralian norm), pronounced [tuˈlun]) is a city on the French Riviera and a large port on the Mediterranean coast, with a major naval base. Located in the Provence-Alpes-Côte d'Azur region, and the Provence province, Toulon is the prefecture of the Var department.

The Commune of Toulon has a population of 176,198 people (2018), making it France's 13th-largest city. It is the centre of an urban unit with 580,281 inhabitants (2018), the ninth largest in France. Toulon is the third-largest French city on the Mediterranean coast after Marseille and Nice.

Toulon is an important centre for naval construction, fishing, wine making, and the manufacture of aeronautical equipment, armaments, maps, paper, tobacco, printing, shoes, and electronic equipment.

The military port of Toulon is the major naval centre on France's Mediterranean coast, home of the French aircraft carrier Charles de Gaulle and her battle group. The French Mediterranean Fleet is based in Toulon.