Chislehurst and Sidcup Grammar School is a mixed-sex grammar school with academy status located in Hurst Road (A222), Sidcup in the London Borough of Bexley, England. It is located adjacent to Lamorbey Park, the Rose Bruford College drama school and Hurstmere School. Pupils at the school are divided into a series of six houses, known as Davies, Edlmann, Lester, Townshend, Williams, and Staff, while an annual school magazine, The Chronicle, is also produced by the students. The current head teacher, Nigel Walker, has held his position since 2009.
Founded as the Sidcup County School for Boys in 1931 to meet the lack of secondary schools in the newly urbanised town, it was initially opened at 27 Station Road, with the position of first headmaster being given to C. R. McGregor Williams. In 1935, the school began moving into a purpose-built site at Crittall's Corner, Footscray, being renamed Chislehurst and Sidcup County School in 1938. Damaged during The Blitz, after the culmination of the Second World War, reforms implemented as a result of the Education Act 1944 led to the local decision that the institution would become a grammar school and that it would relocate to a new, larger building on Hurst Road in the Lamorbey area of Sidcup, a move that took place after the resignation of McGregor Williams in 1954.
As a result of the government's Circular 10/65 in 1965, plans were implemented to merge Chislehurst and Sidcup with the neighbouring Hurstmere into a single comprehensive school, although these were opposed by the successive Conservative Party administrations of Bexley Council, eventually being scuppered under the Conservative government of Prime Minister Margaret Thatcher in the 1980s. In 1973 the school was made co-educational, admitting female pupils alongside the male, resulting in the adoption of its current name. The school rose to national headlines in January 1983 following the suspension of most of the school's sixth form for drinking alcohol at the preceding Christmas party. In 2004 it became a sports college and in 2011 an academy.