This book constitutes the refereed proceedings of the 11th China National Conference on Big Data and Social Computing, BDSC 2026, held in Chongqing, China, during July 24-26, 2026.

The 29 full papers presented in this volume were carefully reviewed and selected from 84 submissions. They organised in the following topical sections as follows : Theories and Foundations of Social Computing; Trustworthy Social Computing for Security and Fairness; Resilient Society and Resilient AI; Data Intelligence and Data Governance; Cross-Modal Social Computing and Applications.