Sir David Harrel (25 March 1841 – 12 May 1939) was an Irish police officer and civil servant.
In 1879 he became a resident magistrate in County Mayo and in 1883 was appointed Chief Commissioner of the Dublin Metropolitan Police.
Although himself a Protestant, he had good relations with the Roman Catholic Church and was a member of several bodies which worked to relieve the poverty of the Irish peasantry.
In 1893, Harrel was appointed Under-Secretary for Ireland, a post he held until 1902, when he retired due to ill-health.
In the 1920 New Year Honours, he was appointed Knight Grand Cross of the Order of the Bath (GCB), having served as chairman of the Interim Court of Arbitration on industrial questions from 1918 to 1919.