Green Templeton College (GTC) is a constituent college of the University of Oxford in the United Kingdom. The college is located on the former Green College site on Woodstock Road next to the Radcliffe Observatory Quarter in North Oxford and is centred on the architecturally important Radcliffe Observatory, an 18th-century building, modelled on the ancient Tower of the Winds in Athens. The Radcliffe Observatory, completed in 1773, was among the earliest purpose-built observatories in Britain and remains a prominent example of Georgian scientific architecture. It is the university's second newest graduate college, after Reuben College, having been founded by the historic merger of Green College and Templeton College in 2008.
The college has a distinctive academic profile, specialising in subjects relating to human welfare and social, economic, and environmental well-being, including medical and health sciences, management and business, and most social sciences. The college is a registered charity. As of 31 July 2024, the College reported total assets of about £103.5 million and total funds of £101.8 million, including an endowment of approximately £1.39 million.