Lancing College is a public school (English private boarding and day school) for pupils aged 13–18) in southern England, UK. The school is located in West Sussex, east of Worthing near the village of Lancing, on the south coast of England. Lancing was founded in 1848 by Nathaniel Woodard and educates c. 600 pupils between the ages of 13 and 18; the co-educational ratio is c. 60:40 boys to girls. Girls were admitted beginning in 1971. The first co-ed, Saints’ House, was established in September 2018, bringing the total number of Houses to 10. There are 5 male houses (Gibbs, School, Teme, Heads, Seconds) and 4 female houses (Fields, Sankeys, Manor, Handford).

The college is situated on a hill which is part of the South Downs, and the campus dominates the local landscape. The college overlooks the River Adur, and the Ladywell Stream, a holy well or sacred stream within the College grounds, has pre-Christian significance. Woodard's aim was to provide education "based on sound principle and sound knowledge, firmly grounded in the Christian faith," and the discipline of the prefect's cane. However John Dancy was appointed headmaster in 1953 to improve academic standards, which had taken second place to prowess in sport. Lancing was the first of a family of more than 30 schools founded by Woodard. Other schools include Ardingly College, Bloxham School, The Cathedral School, Denstone College, and Ellesmere College.

Roughly 65% of pupils are either full or weekly boarders, at a cost of £37,065 per year; 35% are day pupils, at a cost of £25,320 per year. Occasional overnight stays are available to day pupils at an additional cost of £50 per night.

The school is a member of the Headmasters' and Headmistresses' Conference. Girls were first admitted in 1970. The school is dominated by a Gothic revival chapel, and follows a high church Anglican tradition. The College of St Mary and St Nicolas (as it was originally known) in Shoreham-by-Sea was intended for the sons of upper middle classes and professional men; in time this became Lancing College, moving to its present site in 1857.

The school's buildings of the 1850s were designed by the architect Richard Cromwell Carpenter, with later ones by John William Simpson.

In 2003, it was one of fifty of the country's leading independent schools which were found guilty of running an illegal price-fixing cartel which had allowed them to drive up fees for thousands of parents. Each school was required to pay a nominal penalty of £10,000 and all agreed to make ex-gratia payments totalling three million pounds into a trust designed to benefit pupils who attended the schools during the period in respect of which fee information was shared.