John Patrick O'Gara was a French-born soldier of Irish descent who served in the Spanish Army during the eighteenth century.
He was the son of Colonel Oliver O'Gara, a Jacobite exile who left Ireland for France following the surrender of forces loyal to James III under the Treaty of Limerick.
Colonel O'Gara settled in Saint-Germain where James' exiled court was in residence.
O'Gara's career was fairly successful, rising to the rank of Brigadier.
Two of his younger brothers also joined the Spanish Army, while another Charles O'Gara became a courtier at the Austrian court in Vienna.