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Glencorse is a parish of Midlothian, Scotland, lying 7 miles (11 kilometres) south of Edinburgh. It is bounded on the north-west by the former parish of Colinton now within the City of Edinburgh, to the north and west by Lasswade and to the south and west by Penicuik.
The parish is traversed from west to east by Glencorse Burn, part of whose valley contains Glencorse Reservoir, which was formed in 1819-28 by damming the burn's glen with a huge embankment 40 m (130 ft) high. The reservoir is a source of Edinburgh's water supply. Also in the parish are Glencorse Barracks, Bush House, Glencorse House, Woodhouselee and Easter Howgate. The northern part of the parish includes some of the Pentland Hills and the highest point within the parish is Turnhouse Hill (428 m or 1,403 ft).
The parish is divided between two Scottish Parliamentary constituencies: Midlothian North and Musselburgh to the north of Glencorse burn and Midlothian South, Tweeddale and Lauderdale south of the burn.
The parish of Glencorse was formed in 1616 from the ancient parishes of Pentland and Penicuik, the northern part being taken from the parish of Pentland (Barony of Fulford) and the southern part from Penicuik. The parish was originally named after St. Catherine, because of the chapel dedicated to her which stood in the valley of Glencorse Burn, now submerged under the reservoir.
After the 17th-century parish church burned down, a new one (now known as Glencorse Old Kirk) was built 1665 with the north and south aisles being added in 1699. The building has acquired a new roof, and is rented out for weddings, having been superseded for parish use by a much larger church. The previous church of Glencorse became too small for the parish due to the increased numbers of troops at Glencorse Barracks. Robert Trotter, of Bush House, donated funds for a new building and a site to use as a cemetery, namely a field at New Milton farm. The new church was erected in 1885. The font was found in the floor of the Old Kirk during renovations in 1811 and is thought to have originally come from the Chapel of St Catherine, which was flooded during the creation of the Glencorse Reservoir.
A Parochial Board was established under the Poor Law (Scotland) Act 1845. With the Local Government (Scotland) Act 1894 the Parish Council was established, which continued until 1930 when parish councils in Scotland were abolished,. Civil parishes persist for census and other non-administrative purposes.