The AP-9 or Autoestrada do Atlántico is a toll motorway in Galicia, Spain.

It starts in A Coruña and runs south past the cities of Santiago de Compostela, Pontevedra and Vigo, before ending at the town of Tui, a few kilometres north of the Portuguese border at the Minho River.

The first 16 km (10 miles), from A Coruña to the A-6 autovía near the towns of Guísamo and Betanzos, form part of European route E70, while the remainder forms part of European route E01.

The AP-9 has two spurs: the 36 km (22.5 mile) long AP-9F from Guísamo to Ferrol, which runs parallel to the N-651 road and also forms part of European route E01; and the 4 km (2.5 mile) long AP-9V, which runs into the centre of Vigo.

Construction of the motorway, originally known as the A-9, began in the mid-1970s with the section between Pontevedra and Vigo, including the Rande Bridge, and also the section between A Coruña and Santiago de Compostela.