Colleferro is a small town of the Metropolitan City of Rome in the Lazio region of central Italy. It is a residential zone of the metropolitan area of Rome where many different industries and sport structures are located.

From Appia and Plutarch we learn that in 82 BC a decisive battle in the Civil War against Gaius Marius the Younger, took place at Colleferro, which concluded in favor of Silla. At the end of the siege Marius committed suicide.

It was at Colleferro that Italian cyclist and patriot Enrico Toti, on 27 March 1908, had his left leg crushed. The train was stopped at the station to be joined with the Colleferro train. Toti was lubricating the engine of the locomotive and, when the locomotives moved, he slipped causing left leg being trapped and crushed by the gears.

The development of the town began as early as 1912 with the conversion of a long disused sugar factory (the Valsacco factory) to an explosive factory. Initially, the town developed away from where the center is today; the first few buildings (including the Church of St. Joachim) were built within the territory of the nearby town of Valmontone, near the train station that was then called "Segni-Paliano", and was renamed "Segni-Station Colleferro" after the birth of the town.

The engineer Leopoldo Parodi Delfino (former senator and son of the founder of the National Bank, then Bank of Italy) and Senator Giovanni Bombrini founded the 'Bombrini Parodi Delfino explosives factory. Nearby, a new the "BPD Village" was created, and factory workers and their families from throughout Italy moved into them. Later, a cement factory opened (the "Lime & Cement Segni", subsequently acquired by Italcementi), using materials quarried from the nearby town of Segni.

Colleferro continued growing throughout the 1920s and 1930s with still within the municipality of Valmontone. In 1935 Colleferro was incorporated as a new city. Later, Colleferro incorporated portions of the neighboring municipalities of Segni and Paliano.

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