Fredegund (or Fredegunda) (Latin: Fredegundis; French: Frédégonde) (died 597) was the Queen consort of Chilperic I, the Merovingian Frankish king of Soissons.
All her wealth and power came to her through her association with Chilperic. Originally a servant of Chilperic's first wife Audovera, Fredegund won Chilperic's affection and persuaded him to put Audovera in a convent and divorce her. But Chilperic then put Fredegund aside and married Galswintha. Galswintha died the same year, probably strangled by Fredegund(c. 568), who succeeded Galswintha as queen. Galswintha's sister, Brunhilda, however, began a feud which lasted more than 40 years.
Fredegund is said to have ordered the assassination of Sigebert I of Austrasia in 575 and also to have made attempts on the lives of Sigebert's son Childebert II, her brother-in-law Guntram, king of Burgundy, and Brunhilda.
After the mysterious assassination of Chilperic in 584 AD, Fredegund seized his riches and took refuge in the Notre Dame de Paris cathedral. Both she and her surviving son, Clothar II, were protected by Guntram until he died in 592.