The Feynman Lectures on Physics is a three-volume collection based on lectures Richard Feynman delivered to undergraduate students at the California Institute of Technology in the early 1960s, with contributions from Robert B. Leighton and Matthew Sands. The first volume covers mechanics, radiation, heat, and other foundations of classical physics, while the second concentrates on electromagnetism and matter.

The third volume introduces quantum mechanics, including wave-particle behaviour, probability amplitudes, atomic systems, and the principles governing microscopic phenomena. Throughout the work, Feynman emphasises physical reasoning and the connections between mathematical description and observable effects rather than relying only on formal derivations. The lectures range from introductory concepts to discussions that remain challenging for advanced readers. Originally designed as an undergraduate course, the collection became widely used as a reference and teaching resource, reflecting Feynman’s distinctive approach to explaining fundamental physical ideas.