Saint Ida may refer to several Catholic saints:
Itta (died 652), wife of Pepin of Landen and mother of Saint Begga Saint Ita (also known as Ida, d. 570/577), an Irish nun Ida of Herzfeld (c. 788–813), widow of a Saxon duke Ida of Lorraine (1040–1113), noblewoman saint Ida of Toggenburg (c. 1140 – c. 1226), Swiss Christian nun