What is the name of the organization that awards the Stirling Prize?

The Stirling Prize is awarded by the Royal Institute of British Architects (RIBA). This prestigious award, established in 1996, recognizes outstanding architecture in the United Kingdom and is named after the architect Sir James Stirling. RIBA is a professional body that champions better buildings, towns, and cities, and it promotes the importance of architecture in society. The prize serves to highlight and celebrate innovative and exemplary architectural projects, influencing both public perception and the profession at large.

The other organizations mentioned, while significant in their own right, do not award the Stirling Prize. The Royal Academy of Arts focuses on the visual arts and promotes artists, the National Trust is concerned with the preservation of heritage properties and landscapes, and English Heritage is dedicated to protecting historic sites. Each has its own distinct mission and awards but is not involved in the architectural recognition that the Stirling Prize represents.