Euskal Trenbide Sarea
, ), commonly known by its acronym ETS, is a railway infrastructure manager operating in the Basque Country, Spain. The company was formed in 2004, but the railway infrastructure it operates was transferred from Euskotren in 2006. It is a member of the International Union of Railways.
The company owns the network in which Euskotren operates, as well as the infrastructure of the Bilbao and Vitoria-Gasteiz tram systems. It also shares the ownership of lines 1 and 2 of the Bilbao metro with the. The company is also building the Gipuzkoan branch of the Basque Y high-speed line under an agreement with ADIF.