The Strada statale 131 (SS 131) is an Italian state highway 226.0 kilometres (140.4 mi) long in Italy.

It is a freeway that connects the towns of Porto Torres and Cagliari via Sassari, Macomer and Oristano.

Building works begun in the 19th century, under the Kingdom of Charles Felix of Sardinia, the road followed the route of the ancient Roman road Turris Lybissonis-Caralis.

The infrastructure was modernized under fascism, and in the 1970s was rebuilt, becoming a Superstrada (Dual carriageway), some stretches are classified a second category extra-urban road, and the speed limit is 90 km/h, while other ones are considered first category extra-urban road with higher speed limits (110 km/h).

Media related to Strada statale 131 Carlo Felice at Wikimedia Commons