加州理工学院（California Institute of Technology，缩写：Caltech）是一所位于美国加利福尼亚州帕萨迪纳的私立大学，创建于1891年。现有1204名研究生和977名本科生，约有300名教授以及超过600名研究学者。另外，美国国家航空暨太空总署的喷射推进实验室也是由加州理工学院管理。

虽然加州理工学院的规模不大，但是它却是全球最顶尖的大学之一。加州理工学院拥有33位校友或教授获得34次诺贝尔奖，1位校友获得菲尔兹奖（相当于数学界的诺贝尔奖），70位校友获得美国国家科学奖章或国家技术奖章，112位教授获选为美国国家学院院士。

The California Institute of Technology (abbreviated Caltech) is a private doctorate-granting university located in Pasadena, California, United States. Although founded as a preparatory and vocational school by Amos G. Throop in 1891, the college attracted influential scientists such as George Ellery Hale, Arthur Amos Noyes, and Robert Andrews Millikan in the early 20th century. The vocational and preparatory schools were disbanded and spun off in 1910, and the college assumed its present name in 1921. In 1934, Caltech was elected to the Association of American Universities, and the antecedents of NASA's Jet Propulsion Laboratory, which Caltech continues to manage and operate, were established between 1936 and 1943 under Theodore von Kármán. The university is one among a small group of Institutes of Technology in the United States which tends to be primarily devoted to the instruction of technical arts and applied sciences.