The ABAW Workshop is a premier platform highlighting the latest advancements in multimodal analysis, generation, modeling, and understanding of human affect and behavior in real-world, unconstrained environments. It emphasizes cutting-edge systems that integrate facial expressions, body movements, gestures, natural language, voice and speech to enable impactful research and practical applications. The workshop fosters interdisciplinary collaboration across fields such as computer vision, AI, human machine interaction, psychology, robotics, ethics & healthcare. The workshop further addresses complex challenges like algorithmic fairness, demographic bias & data privacy, making it a vital forum for building equitable, generalizable & human-centered AI systems. By uniting experts from academia, industry & government, the workshop promotes innovation, drives knowledge exchange, and inspires new directions in affective computing, behavior modelling and understanding & human-computer interaction. Finally, the Workshop includes a Competition with 6 challenges, including valence-arousal estimation, basic & compound expression recognition, action unit detection, emotional mimicry intensity estimation and ambivalence/hesitancy recognition.