This book contains the proceedings of the 19th International Conference on Social, Cultural, and Behavioral Modeling, SBP-BRiMS 2026, which took place in Pittsburgh, PA, USA, during October 12–14, 2026.

The 24 papers presented in this volume were carefully reviewed and selected from 54 submissions. They are divided into the following themes: Modeling Agents and Behaviors; Large Language Models and Network Modeling; Social Media, Narratives, and Identity.