Edited in collaboration with FoLLI, the Association of Logic, Language and Information this book constitutes the refereed proceedings of the 31st International Workshop on Logic, Language, Information, and Computation, WoLLIC 2025, in Porto, Portugal, during July 2025. The 21 full papers included in this book were carefully reviewed and selected from 57 submissions. The WoLLIC conference aim of fostering interdisciplinary research in pure and applied logic.