Engeltrude de Fézensac (also Ingeltrud, Ingeltrude, or Ingeltrudis Fidentiacus in contemporary Latin; c. 799 – 853) was the Countess of Orléans via her marriage in 825[1] to Odo I, Count of Orléans. Their eldest daughter, Ermentrude, married Charles the Bald of West Francia. They also had a son, William, who was executed by his own brother-in-law in 866.