Area of Outstanding Natural Beauty

An Area of Outstanding Natural Beauty (AONB; Welsh: Ardal o Harddwch Naturiol Eithriadol, AHNE) is one of 46 areas of countryside in England, Wales, or Northern Ireland that has been designated for conservation due to its significant landscape value. Since 2023, the areas in England and Wales have also adopted the name National Landscape (Welsh: Tirwedd Cenedlaethol).

Areas are designated in recognition of their national importance by the relevant public body: Natural England, Natural Resources Wales, and the Northern Ireland Environment Agency respectively. On 22 November 2023, following a review, the AONBs in England and Wales adopted the National Landscapes name, and are in the process of rebranding. AONBs in Northern Ireland did not rename. The name "area of outstanding natural beauty" is still the designated legal term.

In place of the term AONB, Scotland uses the similar national scenic area (NSA) designation. Areas of Outstanding Natural Beauty enjoy levels of protection from development similar to those of UK national parks, but unlike national parks the responsible bodies do not have their own planning powers. They also differ from national parks in their more limited opportunities for extensive outdoor recreation.

There are 46 Areas of Outstanding Natural Beauty, 33 wholly in England, four wholly in Wales, one on the England–Wales border, and eight in Northern Ireland.

The idea for what would eventually become the AONB designation was first put forward by John Dower in his 1945 Report to the Government on National Parks in England and Wales. Dower suggested there was need for protection of certain naturally beautiful landscapes that were unsuitable as national parks owing to their small size and lack of wildness. Dower's recommendation for the designation of these "other amenity areas" was eventually embodied in the National Parks and Access to the Countryside Act 1949 as the AONB designation.

The purpose of an AONB designation is to conserve and enhance the natural beauty of the designated landscape.

There are two secondary aims: meeting the need for quiet enjoyment of the countryside and having regard for the interests of those who live and work there. To achieve these aims, AONBs rely on planning controls and practical countryside management. As they have the same landscape quality, AONBs may be compared to the national parks of England and Wales. National parks are well known in the UK; by contrast, there is evidence to indicate many residents in AONBs may be unaware of the status. However, the National Association of AONBs is working to increase awareness of AONBs in local communities, and, in 2014, successfully negotiated to have the boundaries of AONBs in England shown on Google Maps.

There are 46 Areas of Outstanding Natural Beauty in the United Kingdom: 33 in England, four in Wales, one on the England–Wales border, and eight in Northern Ireland. The first AONB was established in 1956 on the Gower Peninsula in South Wales, and the most recent to be designated is the Tamar Valley AONB, established in 1995. More recent changes include the Clwydian Range AONB being extended in 2012 to form the Clwydian Range and Dee Valley AONB, and the Strangford Lough and Lecale Coast AONBs being merged to form a single AONB in 2010.