The Hospital and Free School of King Charles II, Oxmantown, also called The King's Hospital (KH; Irish: Scoil Ospidéal an Rí) is a Church of Ireland co-educational independent day and boarding school situated in Palmerstown, Dublin, Ireland. It is on an 80-acre campus beside the River Liffey, called Brooklawn, named after the country houses situated on the site and in which the headmaster and his family reside. The school is also a member of the HMC Headmasters' and Headmistresses' Conference and the BSA.

Founded in 1669, it is one of the oldest schools in Ireland and was also known as the Blue Coat School. Although priority is given to those of the main Protestant tradition, as a Christian school, it is attended by students of other denominations and faiths. The school's colours are navy and gold. The school crest is three burning castles with the date "1669", almost identical to the crest for Dublin city. The current headmaster is Mark Ronan.