A grammar school is one of several different types of school in the history of education in the United Kingdom and other English-speaking countries, originally a school teaching Latin, but more recently an academically oriented secondary school.

The Latin school was the grammar school of 14th- to 19th-century Europe, though the latter term was much more common in England. Other terms used include Lateinschule in Germany, or later Gymnasium. Latin schools were also established in Colonial America.