John Osmond (born 1946) is a Welsh writer, journalist, former political candidate for Plaid Cymru, and think tank director. He has contributed to numerous books on the subjects of Welsh politics, culture and devolution, and is also a former television producer. Osmond was the founder director of the independent Welsh think-tank, the Institute of Welsh Affairs in 1996 until May 2013.[1] In 2018 he published the first of a trilogy of documentary novels, Ten Million Stars are Burning, which together record the history of Wales between the 1979 and 1997 devolution referendums. Between 2018 and 2022 he was Special Adviser to Plaid Cymru leader Adam Price. In that capacity, in the wake of the 20212 Senedd election he was involved in negotiating the Co-operation Agreement between Labour and Plaid. In 2024 he published an account of how this emerged and its impact, The Politics of Co-Opposition: The Inside Story of the 2021-24 Co-Operation Agreement between Plaid Cymru and Welsh Labour (Welsh Academic Press).