Ferrocarriles Patagónicos was an Argentine State-owned railway company that built and operated several rail lines in Patagonia region.

FP were part of the Argentine State Railway created in 1909 during the presidency of José Figueroa Alcorta.

During the presidency of José Figueroa Alcorta, the Argentine government devised a plan in 1908 to populate Patagonia by constructing two additional broad gauge, 5 ft 6 in (1,676 mm), railway lines in that part of the country.

The second line was to have branches to Comodoro Rivadavia, via Sarmiento, to Colonia 16 de Octubre and to Buenos Aires Lake.

[2] In 1946 a 402 km (250 mi) long narrow gauge, 750 mm (2 ft 5+1⁄2 in), branch line was opened from Ingeniero Jacobacci to Esquel in Chubut Province and became known affectionately as La Trochita.