Saint Mildthryth (Old English: Mildþrȳð; floruit 694–716x733), also Mildrith, Mildryth or Mildred, was an Anglo-Saxon abbess. Mildthryth was the daughter of King Merewalh of Magonsaete, a sub-kingdom of Mercia, and Eormenburh (Saint Eormenburga), herself the daughter of King Æthelberht of Kent. Her sisters Milburh (Saint Milburga of Much Wenlock) and Mildgytha (Saint Mildgyth) were considered to be saints. Goscelin, probably relying on a now-lost history of the rulers of the Kingdom of Kent, wrote a hagiography of Mildthryth.