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

The original purpose of mediaeval grammar schools was the teaching of Latin. Over time the curriculum was broadened, first to include Ancient Greek, and later English and other European languages, natural sciences, mathematics, history, geography, and other subjects. In the late Victorian era grammar schools were reorganised to provide secondary education throughout England and Wales; Scotland had developed a different system. Grammar schools of these types were also established in British territories overseas, where they have evolved in different ways.

Grammar schools became the selective tier of the Tripartite System of state-funded secondary education operating in England and Wales from the mid-1940s to the late 1960s and continuing in Northern Ireland. With the move to non-selective comprehensive schools in the 1960s and 1970s, some grammar schools became fully independent and charged fees, while most others were abolished or became comprehensive. In both cases, many of these schools kept "grammar school" in their names. Some parts of England retain forms of the Tripartite System, and a few grammar schools survive in otherwise comprehensive areas. Some of the remaining grammar schools can trace their histories to before the 16th century.

Coordinates: 52°34′47″N 1°02′38″W / 52.57985°N 1.04390°W / 52.57985; -1.04390

Leicester Grammar School (often abbreviated to LGS), is an independent secondary school situated in Great Glen, Leicestershire, England. It was founded in 1981, after the loss of the city's state-funded grammar schools.

Leicester Grammar School is closely affiliated with Leicester Grammar Junior School, and in general over 95% of Junior School leavers are accepted by the senior school.

The school has just over 70 teaching staff and 650 pupils, all of whom are day-students. It has its own preparatory form for children in Year 6, and its own sixth form for Years 12 and 13. Each student at the school is a member of a house, allowing a system of intra-school competition in sports and other pastimes such as chess, general knowledge and karaoke.

The school was founded in 1981 as an independent, selective, co-educational day school in an attempt to recapture the standards and traditions of the city’s former grammar schools. Located in four late-Victorian buildings in Leicester City Centre, the school was established close to Leicester Cathedral and was founded with an Anglican Christian ethos. The first headmaster was John Higginbotham and under his stewardship the school grew from just 96 to 560 pupils within 10 years.