SNCF (Société nationale des chemins de fer français; "National society of French railways" or "French National Railway Corporation") is France's national state-owned railway company and manages the rail traffic in France and the Principality of Monaco. SNCF operates the country's national rail services, including the TGV, France's high-speed rail network. Its functions include operation of railway services for passengers and freight, and maintenance and signalling of rail infrastructure.

SNCF employs more than 180,000 people in 120 countries around the globe. The railway network consists of about 32,000 km (20,000 mi) of route, of which 1,800 km (1,100 mi) are high-speed lines and 14,500 km (9,000 mi) electrified. About 14,000 trains are operated daily. Since July 2013, SNCF headquarters are located in a Parisian suburb at 2, place aux Étoiles, 93200 Saint-Denis.

In 2010 SNCF was ranked 22nd in France and 214th globally on the Fortune Global 500 list.

It is the main business of the SNCF group, which in 2014 employed 245,763 people and had €27.2 billion of sales in 120 countries. The chairman of the SNCF group is Guillaume Pépy.