Menton (French: [mɑ̃tɔ̃]; Occitan: Menton in classical norm or Mentan in Mistralian norm, pronounced [menˈta], locally [mɛ(n)ˈtã]; Italian: Mentone [menˈtoːne]; Ligurian: Menton or Mentun depending on the orthography) is a commune in the Alpes-Maritimes department in the Provence-Alpes-Côte d'Azur region on the French Riviera, close to the Italian border.

Menton has always been a frontier town. Since the end of the 14th century, it has been on the border between the County of Nice, held by the Duke of Savoy, and the Republic of Genoa. It was an exclave of the Principality of Monaco until the disputed French plebiscite of 1860 when it was added to France. It had been always a fashionable tourist centre with grand mansions and gardens. Its temperate Mediterranean climate is especially favourable to the citrus industry, with which it is strongly identified.

Although the name's spelling and pronunciation in French are identical to those for the word that means "chin", there does not seem to be any link with this French word. According to the French geographer Ernest Nègre, the name Menton comes from the Roman name Mento. However, it is possible that the name of the city comes from Mons Ottonis (reconstituted) from the name of Otton II, the count of Ventimiglia from 1162-1200. In Mentonasc, the city's name is Mentan, and in Italian Mentone.

An inhabitant of Menton, un mentonnais or un mentonasque in French, would be o mentonasc in the local dialect.

The Menton area has been inhabited since the Paleolithic era, and is the site of the original "Grimaldi Man" find of early modern humans, as well as remains of Neanderthals and Cro-Magnons. In Roman times, the Via Julia Augusta, a road connecting Placentia (now Piacenza) with Arelates (now Arles) passed through Menton, running along the Rue Longue in the old town. The first major settlement occurred during the 11th century CE, when the count of Ventimiglia constructed the Château de Puypin (Podium Pinum) on the Pépin hill, north and west of the modern town centre. During the 13th century, the seigneury of Puypin fell to the Vento family of Genoa who built a new castle along the Roman road, now the site of the Vieux-Château cemetery, providing the core around which the current town grew. Menton was thus incorporated into the Republic of Genoa. The first mention of Menton dates from 21 July 1262, in the peace treaty between Charles of Anjou and Genoa. Its position on the border between the Angevin-ruled Provence and the Republic of Genoa, which at the time claimed Monaco as its western limit, made it a coveted location.

Acquired in 1346 by Charles Grimaldi, Lord of Monaco, Menton was ruled by the princes of Monaco until the French Revolution. Annexed during the Revolution, Menton remained part of France through the First Empire. It belonged to the district of Sanremo in the department of Alpes-Maritimes, which at the time included Monaco and Sanremo.

In 1814, Menton was included in a reconstituted principality of Monaco which, after Napoleon's Hundred Days in 1815, became a protectorate of the king of Sardinia. The princes of Monaco were obliged to do homage to the king for Menton, although not for Monaco itself.^{[citation needed]}

In 1848, Menton, along with its neighbour Roquebrune, seceded from Monaco, due at least in part to a tax imposed on lemon exports. They proclaimed the Free Cities of Menton and Roquebrune during the 1848 revolutions related to the Italian Risorgimento. The Free Cities of Menton and Roquebrune hoped to be part of the Italian kingdom of Sardinia. Two years later they placed themselves under the protection of the Italian kingdom of Sardinia where they were administered by the House of Savoy for ten years.