ALSA (Automóviles Luarca, S.A.) is a Spanish subsidiary of the UK company Mobico Group, which operates bus and coach services in Spain and other countries across Europe, including Andorra, Austria, Belgium, the Czech Republic, France, Germany, Hungary, Italy, Malta, Cyprus, the Netherlands, Poland, Portugal, Romania, Slovakia, Switzerland and Ukraine.

In the 1920s and 1930s the Alsa flagship service was the 170 km Oviedo-Luarca-Ribadeo route, northwest from Oviedo, with thirteen fixed and thirty occasional stops, a 10-hour journey.

Towards the end of the 20th century, Alsa took over several Spanish operators, mainly Empresa Fernandez, based in León, Enatcar and Continental Auto.

In June 2018, it was awarded a 15-year contract to operate services in Rabat, Salé and Temara in a joint venture with local company CityBus.

[3][4] In its early years the ALSA fleet was based mainly on NAG and Saurer vehicles, with some additional GMCs, and De Dion-Boutons, but in 1939/40 they bought around seven British ACLO normal control coaches, which in the early fifties were followed by eight forward control units of the Regal III model of the same make, with bodies by Seida of Bilbao.