The two-volume set LNCS 16493 + 16494 constitutes the revised selected papers of the 30th European Conference on Pattern Languages of Programs, People, and Practices, EuroPLoP 2025, which was held in Irsee, Germany, during July 2?6, 2025. EuroPLoP is the premier European conference on patterns and pattern languages in the fields of software development, system design, human computer interaction, education, business and many more. It is organized by Hillside Europe and is part of the PLoP conference series, which attracts pattern experts from all over the world. Patterns are a unique and effective way to capture and share expertise, tacit knowledge, and research findings. The total of 39 full papers included in the proceedings was carefully reviewed and selected from 58 submissions. The proceedings also contain two focus group reports accepted from 15 focus group submissions. They deal with patterns, pattern languages, their theory, and their practical application, focusing on computing, including software engineering, programming, design, education, and organizational management, while actively exploring synergies with other disciplines.