The Association provides a forum representing archaeologists working for local authorities and national parks throughout the UK. Its members are senior professional archaeologists employed by local authorities to provide advice on archaeological conservation and management.

The range of interest of ALGAO members embraces all aspects of the historic environment including archaeology, built environment and historic landscapes. The Association, through the component national associations, and subject and (in England) regional committees, co-ordinates and presents members' views on a wide range of interests.