This book constitutes the refereed proceedings of the 9th International Conference on Technologies and Innovation, CITI  2023, held in Guayaquil, Ecuador, during November 13-16, 2023.  The 20 full papers included in this book were carefully reviewed and selected from 51 submissions. They were organized in topical sections as follows: Machine Learning; Natural Language Processing and Semantic Web; Computer vision; and Knowledge-based systems.