Isembard, also spelled Isembart, Isembert or Isambard, may refer to:
Isembard (vassal of Charlemagne), a leader of the Reconquista campaign of 805 Isembard, Count of Autun (floruit 850–59), Burgundian nobleman and count of Autun Isembart de Broyes, bishop of Orléans (1033–63) Isembert I, bishop of Poitiers (1021–47) Isembert II, bishop of Poitiers (1047–87)
See also Gormond et Isembart, a medieval epic poem Isambard Isambart