Eton College () is a public school in Eton, Berkshire, England. It was founded in 1440 by Henry VI under the name Kynge's College of Our Ladye of Eton besyde Windesore, making it the 18th-oldest school in the Headmasters' and Headmistresses' Conference (HMC). Originally intended as a sister institution to King's College, Cambridge, Eton is particularly well-known for its history, wealth, and notable alumni (Old Etonians).

Eton is one of only three public schools—along with Harrow (1572) and Radley (1847)—to have retained the boys-only, boarding-only tradition, which means that its boys live at the school seven days a week. The remainder (such as Rugby in 1976, Charterhouse in 1971, Westminster in 1973, and Shrewsbury in 2015) have since become co-educational or, in the case of Winchester, as of 2021 are undergoing the transition to that status. Eton has educated prime ministers, world leaders, Nobel laureates, Academy Award and BAFTA award-winning actors, and generations of the aristocracy, having been referred to as "the nurse of England's statesmen".

The school is the largest boarding school in England ahead of Millfield and Oundle. Eton charges up to £46,296 per year (£15,432 per term, with three terms per academic year, for 2022/23). Eton was noted as being the sixth most expensive HMC boarding school in the UK in 2013–14; however, the school admits some boys with modest parental income: in 2011 it was reported that around 250 boys received "significant" financial help from the school, with the figure rising to 263 pupils in 2014, receiving the equivalent of around 60% of school fee assistance, whilst a further 63 received their education free of charge. Eton has also announced plans to increase the figure to around 320 pupils, with 70 educated free of charge, with the intention that the number of pupils receiving financial assistance from the school continues to increase.