William Richardson

William Richardson (1749 – 23 March 1822) was an Irish landowner and Member of Parliament.

He was the son of William Richardson (1710–1758) of Rich Hill, County Armagh, Ireland and succeeded him to the Richhill estate when only a minor. He was the great-nephew of another William Richardson, who was Member of Parliament for County Armagh at the time of the Williamite War in Ireland.

He was elected High Sheriff of Armagh in 1777 and sat in the Irish House of Commons for County Armagh, between 1783 and 1797. In 1807 he was elected to sit for County Armagh in the House of Commons of the United Kingdom, serving until 1820. They had three daughters, Elizabeth, Isabella and Louisa, who jointly inherited Richhill on their father's death. Only the youngest daughter married (to Edward Bacon, sometime High Sheriff of Armagh), and when she died without heirs in 1881 the estate passed to the Richardsons of Rossfad, near Ballinamallard in County Fermanagh.