Monte Carlo (; Italian: [ˈmonte ˈkarlo]; French: Monte-Carlo [mɔ̃te kaʁlo], or colloquially Monte-Carl [mɔ̃te kaʁl]; Ligurian: Munte Carlu [ˈmuŋte ˈkaɾlu]; lit. '"Mount Charles"') is officially an administrative area of the Principality of Monaco, specifically the ward of Monte Carlo/Spélugues, where the Monte Carlo Casino is located. Informally, the name also refers to a larger district, the Monte Carlo Quarter (corresponding to the former municipality of Monte Carlo), which besides Monte Carlo/Spélugues also includes the wards of La Rousse/Saint Roman, Larvotto/Bas Moulins and Saint Michel. The permanent population of the ward of Monte Carlo is about 3,500, while that of the quarter is about 15,000. Monaco has four traditional quarters. From west to east they are: Fontvieille (the newest), Monaco-Ville (the oldest), La Condamine, and Monte Carlo.

Monte Carlo is situated on a prominent escarpment at the base of the Maritime Alps along the French Riviera. Near the quarter's western end is the "world-famous Place du Casino, the gambling center ... that has made Monte Carlo an international byword for the extravagant display and reckless dispersal of wealth". It is also the location of the Hôtel de Paris, Café de Paris and Salle Garnier (the casino theatre which is the home of the Opéra de Monte-Carlo). The quarter's eastern part includes the community of Larvotto with Monaco's only public beach, as well as its new convention center (the Grimaldi Forum), and the Monte-Carlo Bay Hotel & Resort. At the quarter's eastern border, one crosses into the French town of Beausoleil (sometimes referred to as Monte-Carlo-Supérieur), and 8 kilometres (5 mi) to its east is the western border of Italy.