The LEAP Hand is a low-cost, efficient, and anthropomorphic robotic hand designed for dexterous manipulation and robot learning. The hand is robust, durable, and capable of exerting large torques over extended periods. With a novel kinematic structure that retains all degrees of freedom in any finger position, it supports a wide range of manipulation tasks, including grasping, teleoperation, and in-hand object rotation. The LEAP Hand is open-source, with detailed assembly instructions, simulation tools, and APIs, making it accessible and scalable for research and development.