Rho (Italian: [rɔ]; Lombard: Rò, Latin: Rhaudum) is a town and comune (municipality) in the Metropolitan City of Milan in the Italian region of Lombardy, located about 14 kilometres (9 miles) northwest of Milan.

Rho is lapped by the river Olona and crossed by its tributaries Bozzente and Lura, nowadays partially cloaked inside the town.

At the north and east of the town, there is the Strada statale 33 del Sempione, which in the past was crossing the town itself, in the current corso Europa. Rho is at the meeting point of railways linking Milan to Varese (Line S5) and Domodossola and Milan to Novara (Line S6).

Inside the municipality of Rho are located seven frazioni:

Rho is one of the most ancient towns of Lombardy, originating during the Roman era. This was confirmed by excavations associated with building and road construction in 1876, 1890 and 1917. Additional research during the 20th century showed that the town had remarkable importance during the imperial age.

The current topography can be traced to a style of organization from Roman times: for the most part the roads run parallel in east-west or north–south directions. The reference axis are the cardo (north–south, via Madonna and via Garibaldi) and the Decumano (east–west, via Matteotti and via Porta Ronca).

These roads are crossing in piazza San Vittore, also nowadays in the downtown.

Further archeological research confirmed the existence in Roman age of a road connecting Milan to the Lake Maggiore, passing through Legnano and Gallarate. Along this infrastructure Rho was placed at the 10th mile, the resting point for the army then.

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