Regional anesthesia has entered a new era one defined by ultrasound precision, patient safety, and opioid-sparing care. Yet mastering this rapidly evolving field requires more than fragmented resources or isolated techniques. Modern Atlas of Ultrasound Regional Anesthesia brings clarity, structure, and confidence to one of the most technically demanding skills in contemporary anesthetic practice. This comprehensive atlas is meticulously designed to guide clinicians from foundational principles to advanced, real-world applications. Beginning with ultrasound physics, image optimization, pharmacology, and patient safety, the book establishes a strong conceptual framework before progressing into an extensive, step-by-step atlas of upper extremity, lower extremity, truncal, fascial plane, head and neck, and airway blocks. Each block chapter follows a standardized, clinically intuitive format, integrating: Clear anatomy and sonoanatomy correlations High-yield indications and block coverage Ergonomic patient positioning and probe handling Step-by-step ultrasound-guided techniques Block dynamics, clinical pearls, and troubleshooting Continuous catheter strategies and complication management Beyond routine practice, the atlas addresses special populations including pediatric, obstetric, geriatric, and anticoagulated patients and expands into chronic pain interventions, point-of-care ultrasound (POCUS), and service development, providing a truly holistic view of regional anesthesia. Whether you are refining core skills or mastering advanced blocks such as ESP, QL, PENG, IPACK, and ultrasound-guided airway anesthesia, this atlas serves as both a learning roadmap and a bedside reference. The inclusion of procedural decision guides, LAST management checklists, dosing appendices, and dermatome myotome maps ensures immediate clinical relevance. This is not merely a collection of techniques it is a clinical philosophy grounded in safety, efficiency, and evidence-based practice, designed to improve outcomes while empowering clinicians at every stage of training. Modern Atlas of Ultrasound Regional Anesthesia is an essential resource for anesthesiologists, pain medicine specialists, fellows, and residents seeking mastery in ultrasound-guided regional techniques. Whether used for daily clinical reference, structured learning, or teaching the next generation, this atlas sets a new standard for excellence in regional anesthesia.