Diamond OA 2023 looks at the world of no-fee gold open access or "diamond" OA as of the start of 2023, working from the same database as Gold Open Access 2017-2022. This book also offers a first-pass look at funding sources for diamond journals published by traditional publishers and OA publishers that aren't universities or societies. Contents include profiles for subjects, segments, regions (with brief notes on countries with fewer than ten diamond OA journals) and each of 75 countries with at least ten diamond OA journals.