The ABAW Workshop is a premier platform highlighting the latest advancements in multimodal analysis, generation, modeling, and understanding of human behavior in unconstrained environments. It emphasizes cutting-edge systems that integrate facial expressions, body movements, gestures, natural language, voice to enable impactful research and practical applications. The workshop fosters interdisciplinary collaboration across fields (e.g. computer vision, AI, HCI, psychology, robotics, ethics & healthcare) and is a vital forum for building equitable, generalizable & human-centered AI systems. Finally, the Workshop also includes 3 challenges (Valence-Arousal Estimation, Compound Expression Recognition and Fine-Grained Violence Detection).