The Ceneri Base Tunnel (CBT) () is a railway base tunnel in Switzerland's Canton Ticino. It passes under Monte Ceneri between Camorino in the Magadino Flat and Vezia near Lugano, and bypasses the former high-altitude rail route through the Monte Ceneri Tunnel. It is composed of two single-track tunnels, each long. It is part of the New Railway Link through the Alps (NRLA) project for faster north-south rail links across the Swiss Alps.