This book constitutes the proceedings of the third Latin American Workshop, LAFUSION 2025, held in Rio de Janeiro, Brazil, during November 27–28, 2025.

The 12 full papers and 4 short papers included in these proceedings were carefully reviewed and selected out of 46 submissions. The papers deal with information fusion focusing on topics such as sensor fusion, multimodal learning, distributed and federated fusion architectures, uncertainty modeling, and more.