A direct grant grammar school was a type of selective secondary school in the United Kingdom that existed between 1945 and 1976. One quarter of the places in these schools were directly funded by central government, while the remainder attracted fees, some paid by a Local Education Authority and some by the pupils' parents or guardians. On average, the schools received just over half of their income from the state.

The status was introduced in England and Wales by the Education Act 1944 as a modification of an existing direct grant scheme to some long standing endowed grammar schools. There were 179 direct grant grammar schools, which, together with almost 1,300 grammar schools maintained by local authorities, formed the most academic tier of the Tripartite System. They varied greatly in size and composition, but, on average, achieved higher academic results than either maintained grammar schools or private schools.

State secondary education was reorganised on comprehensive lines in the late 1960s and early 1970s. The direct grant was phased out from 1975 and the schools were required to choose between becoming maintained comprehensive schools or fully independent schools. Forty-five schools, almost all Roman Catholic, joined the state system, while a few closed. The rest (including all the secular schools) became independent and mostly remain as highly selective independent schools.

In the 19th century, few boys and very few girls in England and Wales received secondary education, which was typically available only from charity, endowed or private schools. During this time, secondary provision expanded and adjusted to growing demand. At the start of that century, some boarding schools like Eton College and Winchester College thrived educating the sons of the aristocracy, but most endowed grammar schools were in decline, their classical curricula seen as irrelevant to the industrial age. These schools were reformed under the Endowed Schools Act 1869, which also led to many endowments being diverted to the creation of girls' schools. In the meantime a range of other schools had appeared. After the Roman Catholic Relief Act 1829 and mid-century Irish immigration, Catholic teaching orders from Ireland and mainland Europe began to establish their own grammar schools. New proprietary schools were established, initially as joint-stock companies, converting to charities if they were successful. One of the largest such companies was the Girls' Public Day School Company (later Trust), set up to provide an affordable academic education for girls, which had established 32 schools by 1894.

In the latter part of the century, many of the less wealthy schools received annual grants from the Department of Science and Art and from their county councils. The grant system was restructured when the Board of Education was created in 1901 to fund early secondary schools, and the Education Act 1902 gave counties and county boroughs responsibility for schools, designating them as local education authorities (LEAs). Secondary schools controlled by voluntary bodies could receive a grant from either the Board of Education or their local authority, or both. In return they were required to meet the Board's regulations, and were subject to the same system of inspections as state-funded schools. Under the Free Place Regulations of 1907, secondary schools in receipt of grant were required to admit a specified proportion of their intake, usually 25%, free of charge from state elementary schools. Suitable pupils were selected using a scholarship examination.

Circular 1381, a directive issued by the Board of Education in 1926, required that schools choose a single source of grant: they could receive a "direct grant" from central government, or be "grant-aided" by their local authority. By 1932 there were 240 secondary schools receiving a direct grant, compared with 1138 aided by local authorities. Although this division was intended purely as an administrative convenience, local authorities gradually gained more influence over the schools they aided, in part because of the schools' weak financial position during the Great Depression.

The Depression and the falling birth rate in the pre-war years had also weakened independent schools and schools receiving the direct grant. At the same time, the state-funded sector had grown to the point where universal secondary education seemed achievable, and changes in society had made the idea more popular. Proposals were made for a reorganisation of the maintained sector, including a new accommodation with the voluntary schools. In response, the Headmasters' Conference persuaded the President of the Board of Education, R.A. Butler, to establish a commission under Lord Fleming in July 1942 "to consider means whereby the association between the Public Schools ... and the general education system of the country could be developed and extended".

The Education Act 1944 aimed to introduce a universal system of secondary education for England and Wales. Under the Tripartite System, there were to be three types of schools, with pupils sitting an eleven plus exam to determine which type of school they would be sent to. The most academic tier would be the grammar school, and the Act revised the terms of the direct grant to operate alongside LEA-maintained grammar schools, many of which were former LEA-aided schools. The latter schools, unable to cope with the costs of the reorganisation required by the 1944 Act, had been offered the status of voluntary controlled or voluntary aided schools, under which the state would pay all their running costs and all or most of their capital costs. They were thus integrated into the state system.