The SAT ( ess-ay-TEE) is a standardized test widely used for college admissions in the United States. Since its debut in 1926, its name and scoring have changed several times. For much of its history, it was called the Scholastic Aptitude Test and had two components, Verbal and Mathematical, each of which was scored on a range from 200 to 800. Later it was called the Scholastic Assessment Test, then the SAT I: Reasoning Test, then the SAT Reasoning Test, then simply the SAT.

The SAT is wholly owned, developed, and published by the College Board, a private, not-for-profit organization in the United States. It is administered on behalf of the College Board by the Educational Testing Service, which until recently developed the SAT as well. The test is intended to assess students' readiness for college. Originally designed not to be aligned with high school curricula, several adjustments were made for the version of the SAT introduced in 2016. College Board president David Coleman added that he wanted to make the test reflect more closely what students learn in high school with the new Common Core standards, which have been adopted by the District of Columbia and many states.

Starting with the 2015–16 school year, the College Board began working with Khan Academy to provide free SAT preparation. On January 19, 2021, the College Board announced the discontinuation of the optional essay section, as well as its SAT Subject Tests, after June 2021.

While a considerable amount of research has been done on the SAT, many questions and misconceptions remain. Outside of college admissions, the SAT is also used by researchers studying human intelligence in general and intellectual precociousness in particular, and by some employers in the recruitment process.