The OpenFOAM Workshop, the world's most important annual meeting of the OpenFOAM community, will take place in Vienna from June 30 to July 4, 2025. The 20th edition will be hosted by the AIT Austrian Institute of Technology, which is bringing together leading minds from science, industry, and software development for this anniversary event. The focus will be on the latest developments in the open-source software OpenFOAM®, innovative simulation techniques, and the future of computational fluid dynamics (CFD).