Diamond OA 2025 looks at the world of5no-fee gold open access or "diamond" OA as of the start of 2024, working from the same database as Gold Open Access 2025. This book also offers a quick 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 80 countries with at least ten diamond OA journals.