Himiltrude ( – c. 780?) was the mother of Charlemagne's first-born son Pepin the Hunchback. Some historians have acknowledged her as the wife of Charlemagne, though she is often referred to as a concubine. The appearance of her name in the fraternity books of Alemannian monasteries may suggest an affiliation with the Germanic Alemannian or Alsatian nobility, while other sources make her the daughter of a Burgundian count and a granddaughter of Grimbert I, Count of Paris. It is not possible, however, to extrapolate any political ramifications from Charlemagne's relationship with Himiltrude.
Her son Pepin, who had a spinal deformity and was called "the Hunchback", was eclipsed by Charlemagne's sons from his later marriage to Hildegard. Following an attempted rebellion against his father, Pepin was confined to a monastery. and Paulus Diaconus speaks of Pepin's birth "before legal marriage".
Historians have interpreted the information in different ways. Some, such as Pierre Riché, follow Einhard in describing Himiltrude as a concubine. Others, Dieter Hägemann for example, consider Himiltrude a wife in the full sense.