This book constitutes the refereed proceedings of the 18th International Conference on Intelligent Computer Mathematics, CICM 2025, held in Brasilia, Brazil, during October 6–11, 2025.

The 24 full papers were presented in this volume were carefully reviewed and selected from 34  submissions. They were organized in the following topical sections as follows : Automated Reasoning; Formal Libraries; Logical and Linguistic Foundations; Mathematical Knowledge Management; Neural Language Models; and Proof Assistants and Formalizations.