The radial nerve block is a regional anaesthesia technique used for surgical procedures involving the forearm and hand. Originating from the posterior cord of the brachial plexus (C5-T1), the radial nerve travels through the posterior arm before emerging anteriorly at the lateral epicondyle of the humerus, where it divides into superficial (sensory) and deep (motor) branches. The superficial radial nerve supplies sensation to the dorsal lateral hand, while the deep branch innervates the extensor muscles of the forearm. This block is commonly used for forearm and hand surgeries, particularly when upper arm tourniquet analgesia is not required. It is also a valuable rescue technique for failed proximal nerve blocks. Ultrasound guidance improves accuracy by allowing real-time nerve identification at the lateral aspect of the lower arm or in the antecubital fossa. The block is performed using in-plane or out-of-plane techniques, ensuring precise deposition of local anaesthetic while avoiding vascular structures. Compared to proximal brachial plexus blocks, the radial nerve block preserves upper limb mobility, making it advantageous for selective analgesia. It is a safe and effective technique with minimal complications when performed correctly.