On 6 December 2019, the Oxford Institute for Ethics, Law and Armed Conflict at the Blavatnik School of Government, in collaboration with the James Martin Center for Nonproliferation Studies, hosted a one-day workshop to examine the future of the Iran nuclear deal (formally known as the Joint Comprehensive Plan of Action,or JCPOA). The workshop gathered over twenty leading non-proliferation, Iran and Middle East experts from government, academia and the private sector to discuss, under the Chatham House Rule, plausible future scenarios for the JCPOA and associated implications for non-proliferation and regional security. This workshop report covers the status and prospects of the JCPOA, transatlantic relations and E3 (France, Germany and the UK) strategies, and future outlooks for the JCPOA and regional non-proliferation.