The Wye Valley Area of Outstanding Natural Beauty is an internationally important protected landscape straddling the border between England and Wales.

It is one of the most dramatic and scenic landscape areas in southern Britain.

The River Wye is the fifth-longest river in the United Kingdom. The upper part of the river passes through the settlements of Rhayader, Builth Wells and Hay-on-Wye, but the area designated as an AONB covers 326 square kilometres (126 sq mi) surrounding a 72-kilometre (45 mi) stretch lower down the river, from just south of the city of Hereford to Chepstow.

This area covers parts of the counties of Gloucestershire, Herefordshire and Monmouthshire, and is recognised in particular for its limestone gorge scenery and dense native woodlands, as well as its wildlife, archaeological and industrial remains.

It is also historically important as one of the birthplaces of the modern tourism industry. The area is predominantly rural, and many people make a living from tourism, agriculture or forestry.

Ross-on-Wye is the only town within the AONB itself, but Hereford, Monmouth, Coleford and Chepstow lie just outside its boundaries.