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Brentwood School is a selective, independent day and boarding school in Brentwood, Essex, England in the public school tradition. The school comprises a preparatory school, senior school and sixth form, as well as boarding provision for both boys and girls. The school is coeducational, and employs the "Diamond Model". The school is a member of the Headmasters' and Headmistresses' Conference, the IAPS, and the AGBIS.

Founded in 1557 and opened in 1558, the school has a Tudor schoolroom, a Victorian chapel and several Grade II listed buildings. Situated on Ingrave Road, astride Middleton Hall Lane and Shenfield Road, the school is set in over 72 acres (29 hectares) of land in the centre of Brentwood. The current headmaster is Michael Bond.

The licence to found the school as The Grammar School of Antony Browne, Serjeant at the Law, in Brentwood was granted by Queen Mary I to Sir Antony (or Anthony) Browne on 5 July 1558. The first schoolmaster, George Otway, was appointed on 28 July 1558.

In 1568, a year after Browne's death, the school moved to a purpose-built schoolroom, which is extant. The commemoration stone was laid by Browne's stepdaughter, Dorothy Huddleston, and her husband Edward, Browne's marriage having been childless.

The school room is beside the site of the execution of nineteen-year-old William Hunter, who was burned at the stake for denying the doctrine of transubstantiation. The Martyr's Elm grew, allegedly, on the spot of his immolation. It was Browne who, as a Justice of the Peace under Queen Mary, had sentenced Hunter. Some believe the school was founded as Browne's penance for Hunter's martyrdom when Queen Elizabeth I came to the throne; however, the school was already in operation under Mary's licence when Elizabeth succeeded.

Although Browne had drawn up statutes for the school, they were never legally adopted and so were re-drawn in 1622 by his descendants and John Donne, Dean of St Paul's.

Brentwood School Combined Cadet Force (CCF) was founded in 1861 and so is one of the earliest CCFs in the country.

Sixty Old Brentwoods were killed on active service during the First World War and 173 during the Second World War. Their names are listed in the school chapel, and commemorated by the Memorial Hall for the first war and the pavilion for the second. The school was a direct grant grammar school from the 1960s until the abolition of the scheme in 1977.

Brentwood was originally a boys' school, but the Governors made the decision to allow a small number of girls to enter the sixth form in 1974. By the early 1980s there were 23 girls in the sixth form. Initially based in Newnum House, the girls' school opened in 1988, admitting girls from ages 11 to 18.

In 2007, Brentwood School celebrated its 450th anniversary with a commemorative service in St Paul's Cathedral.

The school's Combined Cadet Force (CCF) celebrated its 150th anniversary on 8 October 2011 by holding a special afternoon of events featuring the inspection of a Guard of Honour by Lt General Brown CBE. The Royal British Legion Youth Band of Brentwood played at the start and end of the afternoon.

In 2012, the Earl of Wessex visited the school to open the new sixth form centre, featuring a 400-seat auditorium, named The Wessex Auditorium in his honour.

In 2024, former Director of Music at Brentwood School, David Pickthall (born 28 September 1958), was convicted of a variety of sexual offences against the pupils of Brentwood School, who were aged between 9 and 16 at the time of the abuse. The abuse was committed over a sustained period from 1979 to 2021. He was sentenced on 11 November 2024 at Chelmsford Crown Court to serve a jail sentence of 12 years.

The arms of Brentwood School are derived from those of the founder, Sir Antony Browne, and his wife.

As part of the commemoration of the 400th anniversary of the school's founding, a special variant of Sir Antony Browne's Coat of Arms was granted by the Honourable Sir George Rothe Bellew, Garter Principal King of Arms and Sir John Dunamace Heaton-Armstrong, Clarenceux King of Arms on 19 July 1957. A red border was added to the arms to distinguish them as the school's, as opposed to those of Browne.

The school is separated into three sections: the preparatory school (ages 3 to 11), the senior school (ages 11 to 16) and the sixth form (ages 16 to 18). Brentwood operates in a diamond school format, in which the preparatory school and sixth form are co-educational while the senior school teaches boys and girls separately.

Brentwood Preparatory School teaches children aged 3–11, from Nursery through to Year 6. Classes were usually small prior to 2014, with an average size of 20 per class.

The senior school teaches pupils from the age of 11 until the end of GCSE courses at 16+. Many pupils move into the senior school from the preparatory school, but others are drawn from other local primary and preparatory schools; around 1/3 of pupils join the school from the maintained sector. Admission to the senior school is by entrance examination.

The sixth form is for pupils aged 16‑18 who are studying for 'A' levels, the International Baccalaureate and BTec Extended Diploma in Sport or Business. There are currently c.300 pupils in the sixth form.

Sports offered include Association football, cricket, fencing, gymnastics, hockey, netball, rifle shooting, Rugby football, squash, swimming and tennis. School teams have met with some success over the years, for example winning the Essex Schools FA Cup three times in four seasons.

In 2008 the school U13 cricket team won the National Schools Cup (Bunbury Cup), to be crowned National Champions, having finished as runners up in 2007.

The school is set in 72 acres (29 ha) of grounds and has two playing-fields; one is situated directly on the school site and another, The Heseltines, adjacent to the school. These contain football, rugby, cricket and hockey pitches, an all-weather AstroTurf pitch, tennis and netball courts, an athletics track and field