Ouigo España is an open-access operator of high-speed railway services in Spain. It is a subsidiary of SNCF Voyageurs, the French national railway company, and uses its trademark Ouigo.

Ouigo is a French low-cost service range of both conventional and high-speed trains. The literal translation of Ouigo from French to English is "yes go"; the name is also a play on words with the English homonym "we go." It is composed of two different services: Ouigo Grande Vitesse, which is a brand of SNCF operating high-speed trains; and Ouigo Vitesse Classique, a brand under which Oslo, a subsidiary of SNCF, operates conventional speed trains.