Patrick Lynch (1715–1789) was an Irish emigrant who became a significant landowner in the Rio de la Plata region, which is now part of Argentina.

[1] He was born in Galway and was the second son of Captain Patrick Lynch of Lydican Castle and Agnes Blake.

[2] The Lynches left Ireland after their defeat at the hands of Cromwell's forces and later those of William of Orange.

Patrick left in the 1740s for Bilbao, Spain, and travelled from there to Rio de la Plata, where he was appointed "regidor" (royal representative) and captain in the "Milicias".

His eldest surviving son, Justo Pastor Lynch who was a customs official under Viceroy Cisneros, also a captain and regidor, inherited Captain Lynch's vast land holdings.