爱德华·李·桑代克（Edward Lee Thorndike，1874年8月31日－1949年8月9日），美国心理学家，心理学行为主义的代表人物之一。他几乎终生在哥伦比亚大学教育学院执教。他从研究动物的实验中，领会到它们的学习过程，从而提出他的联结主义理论：刺激（S）－反应（R）公式。被认为是教育心理学的奠基人。

桑代克最著名的贡献就是迷箱实验，通过观察猫如何从迷箱中逃脱，总结出三条学习定律：准备律、效果律和练习律。

桑代克的迷箱实验旗帜鲜明的的厌弃动物是利用诸如顿悟这类特别的方式来解决问题的说法：「首先，大部分书与其说给我们心理学，还不如说是动物的颂歌。它们都是关于动物的智力，从没有关于动物的愚蠢。」（动物智力，1911年）（不久约翰·华生应用于人类，得出同样的意见）

Edward Lee "Ted" Thorndike (August 31, 1874 – August 9, 1949) was an American psychologist who spent nearly his entire career at Teachers College, Columbia University. His work on Comparative psychology and the learning process led to the theory of connectionism and helped lay the scientific foundation for modern educational psychology. He also worked on solving industrial problems, such as employee exams and testing. He was a member of the board of the Psychological Corporation and served as president of the American Psychological Association in 1912. A Review of General Psychology survey, published in 2002, ranked Thorndike as the ninth most cited psychologist of the 20th century. Edward Thorndike had a powerful impact on reinforcement theory and behavior analysis, providing the basic framework for empirical laws in behavior psychology with his Law of Effect. Through his contributions to the behavioral psychology field came his major impacts on education, where the Law of Effect has great influence in the classroom.