The Cambridgeshire Guided Busway is a guided busway that connects Cambridge, Huntingdon and St Ives in Cambridgeshire, England. It is the longest guided busway in the world, surpassing the O-Bahn Busway in Adelaide, South Australia.

Guided buses are buses capable of being steered by external means, usually on a dedicated track or roll way that excludes other traffic, permitting the maintenance of schedules even during rush hours. Unlike railbus, trolleybuses or rubber-tyred trams, for part of their routes guided buses are able to share road space with general traffic along conventional roads, or with conventional buses on standard bus lanes.