Optimization and learning : 6th International Conference OLA 2023 Malaga Spain May 3 5 2023 proceedings This book constitutes the refereed proceedings of the 6th International Conference on Optimization and Learning OLA 2023 held in Malaga Spain during May 3 5 2023. The 32 full papers included in this book were carefully reviewed and selected from 78 submissions. They were organized in topical sections as follows: advanced optimization; learning; learning methods to enhance optimization tools; optimization applied to learning methods; and real world applications