Egidia de Lacy, Lady of Connacht (c. 1180 – 24 February 1240), was a Cambro-Norman noblewoman, the wife of Richard Mór de Burgh, 1st Baron of Connaught and Strathearn (c.1180–1242), and the mother of his seven children, including Sir William Óg de Burgh, a lord and warrior and Walter de Burgh, the first Earl of Ulster.
Her brother Gilbert de Lacy (c. 1202 – d. 1230) married Isabel Bigod, by whom he had issue.
Her sister Pernel de Lacy (c.1201 – after 25 November 1288), married firstly, William Saint Omer, and secondly, Ralph VI de Toeni, by whom she had issue.
On 21 April 1225[citation needed] she married Richard Mor de Burgh (1194 –17 February 1243), Lord of Connacht (May 1227- 1242/1243), Justiciar of Ireland (1228–1232), the son of William de Burgh and More O' Brien, daughter of Donal Mor mac Turlough O' Brien, King of Thomond and Orlachan MacMurrough of Leinster.
The marriage produced seven children: Egidia died on 24 February 1240 Connaught Ireland.