The AS-III is a highway in Asturias, Spain that connects Langreo and Avilés.

Despite being a splitting of the AS-17 road, it continues working with this name.

The first section of the motorway was opened in October 2011 and links Lugo de Llanera with Viella, Siero.

[1] On 12 July 2014, the section between Riaño, Langreo and San Miguel de la Barreda was opened.

This section has three tunnels and cost €108m.