The Autostrada A23 or Autostrada Alpe-Adria ("Alps-Adria motorway") is an autostrada (Italian for "motorway") 120 kilometres (75 mi) long in Italy located in the region of Friuli-Venezia Giulia which connects the Autostrada A4 (Turin–Trieste) near Palmanova via Udine to Tarvisio and the Austrian A2 Süd Autobahn.

It is a part of the E55 European route.

The Autostrada A23 is one of the main transport links between Northeast Italy and Central Europe.