Rheidol

Rheidol can refer to:
 * Afon Rheidol, a river in Mid-Wales
 * Vale of Rheidol Railway, a narrow-gauge railway in Mid-Wales
 * Rheidol power station, a hydroelectric scheme on the Afon Rheidol
 * Rheidol (locomotive), a former locomotive on the Vale of Rheidol Railway
 * Rheidol Falls railway station, a station on the Vale of Rheidol Railway