This book constitutes the refereed proceedings of the Third International Workshop on Automated Spatial and Temporal Anomaly Detection, ASTAD@AAAI 2026, held in conjunction with AAAI 2026, Singapore, on January 26, 2026.

The 9 full papers included in this book were carefully reviewed and selected from 18 submissions. They cover diverse areas, including vehicle engine diagnostics, thermal fault detection for energy storage systems, spatially conditioned diffusion models for anomaly generation, and domain-adaptive video
captioning for surveillance.