Ermengarde (or Irmingard) of Hesbaye (778 – 3 October 818), probably a member of the Robertian dynasty, was Carolingian empress from 813 and Queen of the Franks from 814 until her death as the wife of the Carolingian emperor Louis the Pious.

"Sweet Ermengarde" is a short comic story by American horror fiction writer H. P. Lovecraft under the pseudonym "Percy Simple".

Ermengarde of Anjou (– 18 March 1076), known as Blanche, was a Duchess consort of Burgundy.