The Denguin rail crash occurred on 17 July 2014 when a TER passenger train collided with a SNCF TGV express train near Denguin, Pyrnes-Atlantiques, France. Forty people were injured, four seriously.

Transport express régional (French pronunciation: ​[tʁɑ̃spɔʁ ɛksprɛs ʁeʒjɔnal], usually shortened to TER) is the brand name used by the SNCF, the French national railway company, to denote rail service run by the regional councils of France, specifically their organised transport authorities. The network serves French regions; Île-de-France (Transilien) and Corsica (CFC) have their own specific transport systems. Every day, over 800,000 passengers are carried on 5,700 TER-branded trains.TER is part of SNCF Voyageurs, a branch of the SNCF dealing with urban and regional passenger rail, which also includes Transilien, Intercités, Chemins de fer de la Corse (CFC), Keolis, and Effia.