Wansford Tunnel is a railway tunnel on the preserved Nene Valley Railway in Cambridgeshire.
The tunnel is situated somewhat to the south of the village of Wansford, but just to the west of Wansford railway station. It was on the Blisworth to Peterborough line opened in 1847 by the London and Birmingham Railway. The line originally was double track. Today, however only a single track runs through it. The tunnel is 616 yards long but has no ventilation shafts. Just to the west of the tunnel the NVR has opened a new station, Yarwell Junction railway station in 2006.
The hamlet of Sibson is on top of the tunnel.