理乍得·菲利普斯·费曼（英语：Richard Phillips Feynman，1918年5月11日－1988年2月15日），美国理论物理学家，量子电动力学专家，纳米技术之父。由费曼提出或完善的费曼图、费曼规则和重整化计算方法是研究量子电动力学和粒子物理学的重要工具。费曼个性十足，平易近人且喜爱搞怪，有很多逸闻流传于世。英国杂志物理世界在1999年的民意调查130全球领先的物理学家，他被评为有史以来十位最伟大的物理学家之一。

费曼业余爱好广泛，如打邦哥鼓、破译玛雅文明的象形文本、研究如何撬开保险柜的锁及逛脱衣舞厅等。他自己搜罗了不少这类故事，整理成了自传《别闹了，费曼先生》。该书后来成为畅销大众读物。费曼是少数几个在大众心目中形象生动鲜活的前沿科学家之一。

Richard Phillips Feynman (/ˈfaɪnmən/; May 11, 1918 – February 15, 1988) was an American theoretical physicist known for his work in the path integral formulation of quantum mechanics, the theory of quantum electrodynamics, and the physics of the superfluidity of supercooled liquid helium, as well as in particle physics for which he proposed the parton model. For his contributions to the development of quantum electrodynamics, Feynman, jointly with Julian Schwinger and Sin-Itiro Tomonaga, received the Nobel Prize in Physics in 1965. He developed a widely used pictorial representation scheme for the mathematical expressions governing the behavior of subatomic particles, which later became known as Feynman diagrams. During his lifetime, Feynman became one of the best-known scientists in the world. In a 1999 poll of 130 leading physicists worldwide by the British journal Physics World he was ranked as one of the ten greatest physicists of all time.