The name Ealdgyth (Old English: Ealdgȳð; sometimes modernized to Aldith, may refer to

• Ealdgyth, daughter of Uhtred the Bold, Earl of Northumbria (died 1016) and Ælfgifu who is a daughter of Æthelred II
• Ealdgyth (floruit 1015–1016) (born c. 992), wife of Sigeferth and then of King Edmund Ironside
• Ealdgyth, wife of the thane Morcar (died 1015)
• Ealdgyth, daughter of Earl Ælfgar (fl. c. 1057 – 1066), wife of Gruffudd ap Llywelyn and later of Harold Godwineson
• Edith Swanneck (c. 1025 – c. 1086), concubine of Harold Godwineson
• Ealdgyth of Wallingford, daughter of Wigot and wife of Robert D'Oyly (died 1091)

• Eadgyth (disambiguation), Old English form of the name (Edith)
• Eadgifu, sometimes Latinized as Ediva or Edgiva

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