| Colchester High School | |
| Motto: | God first, Others second, Self last. |
| Established: | 1882 |
| Type: | Private day school |
| Religious Affiliation: | Christian |
| Head Label: | Headteacher |
| Head: | Karen Gracie-Langrick |
| Chair Label: | Chair of Governors[1] |
| Chair: | David Baldwin |
| Country: | England |
| Dfeno: | 881/6015 |
| Urn: | 115409 |
| Ofsted: | In Nursery |
| Staff: | 86 |
| Enrolment: | 380 |
| Gender: | Mixed |
| Lower Age: | 2 1/2 |
| Upper Age: | 16 |
| Houses: | Normans Romans Saxons Danes |
| Colours: | Blue and yellow |
| Publication: | The Royal Blue |
Colchester High School is a coeducational independent school located in Colchester in Essex, England. The school is owned and operated by the Cognita Group. Colchester High is the only coeducational independent school in Colchester to offer secondary education.
The school was a girls' school when it opened in 1882. It took boys from 1910, becoming an all-boys establishment over the course of the next 20 years. In 1993 the school started admitting girls again. The school is still affectionately known by many of the Old pupils from before it became co-educational as the "Boys'" or "Boys' High".
The first Principal, Mr. Grӧne, stoutly refusing all approaches by the County Education Committee to incorporate the School into its education remit. It has pursued its independent course ever since, despite a spell as a hospital annexe from 1917 to 1918 and being strafed in 1941. For many years the school was family owned. In 2005, it was bought by Cognita, the largest independent schools business in the UK.
The school admits pupils aged 2 1/2 to 16 from a wide catchment area including Colchester, Braintree, Marks Tey, Coggeshall, Kelvedon, Tiptree, Maldon, and Wivenhoe. Entry is normally at ages 2 1/2–15.
The 2008 GCSE results for the school were at a high standard, making Colchester High one of the top ranking schools in Essex.
Class sizes are typically with approx. 16–18 in a class, although this has grown recently.
The school has an 'Old Boys and Girls Association' which all Old Colcestrians are eligible to join once they have left the school, often after their exam year.
The school has four houses: Normans (Royal Blue); Saxons (Old Gold); Romans (Red); and Danes (Forest Green).
The school plays several sports: Rugby; Football; Cross Country; Hockey; Athletics; and Cricket. During each Year's PE lessons the main sports are Badminton; Indoor Cricket; Darts; Circuit Training; Volleyball and Basketball.