Joan de Geneville, 2nd Baroness Geneville

Joan de Geneville, 2nd Baroness Geneville, Countess of March, Baroness Mortimer (2 February 1286 – 19 October 1356), also known as Jeanne de Joinville, was the daughter of Sir Piers de Geneville and Joan of Lusignan. She inherited the estates of her grandparents, Geoffrey de Geneville, 1st Baron Geneville, and Maud de Lacy, Baroness Geneville. She was one of the wealthiest heiresses in the Welsh Marches and County Meath, Ireland. She was the wife of Roger Mortimer, 1st Earl of March, the de facto ruler of England from 1327 to 1330. She succeeded as suo jure 2nd Baroness Geneville on 21 October 1314 upon the death of her grandfather, Geoffrey de Geneville.

As a result of her husband's insurrection against King Edward II of England, she was imprisoned in Skipton Castle for two years. Following the execution of her husband in 1330 for usurping power in England, Joan was once more taken into custody. In 1336, her lands were restored to her after she received a full pardon for her late husband's crimes from Edward II's son and successor, Edward III of England.

Joan was born on 2 February 1286 at Ludlow Castle in Shropshire. She was the eldest child of Sir Piers de Geneville, of Trim Castle and Ludlow, whose father Sir Geoffrey de Geneville, 1st Baron Geneville, was Justiciar of Ireland. Her mother Jeanne of Lusignan was part of one of the most illustrious French families, daughter of Hugh XII of Lusignan, Count of La Marche and of Angoulême, and sister of Yolanda of Lusignan, the suo jure Countess of La Marche. Joan had two younger sisters, Matilda and Beatrice who both became nuns at Aconbury Priory. She also had two half-sisters from her mother's first marriage to Bernard Ezi III, Lord of Albret: Mathe, Dame d'Albret (died 1283), and Isabelle, Dame d'Albret (died 1 December 1294), wife of Bernard VI, Count of Armagnac.