Ianthe (Ἰάνθη; English translation: "purple or azul flower") may refer to:
Greek mythology
- Ianthe, Cretan girl who married Iphis after Isis turned Iphis from a woman into a man
- Ianthe (mythology), one of the 3,000 Oceanids
People
- Ianthe Jerrold (1898–1977), British novelist
- Ianthe Elizabeth Brautigan (born 1960), American writer, daughter of Richard Brautigan
- Ianthe Jeanne Dugan, investigative reporter for the Wall Street Journal
- Ianthe Thomas (1951–2002), American children's author
- Ianthe, Lord Byron's nickname for Lady Charlotte Harley, to whom Childe Harold's Pilgrimage is dedicated
- Ianthe, Walter Savage Landor's nickname for his unrequited love Sophia Jane Swift
- Ianthe, nickname of actress Mary Saunderson
- Ianthe, a pen name of Emma Catherine Embury
Fiction
- Ianthe, character in Queen Mab (poem) by Percy Bysshe Shelley who named a daughter Ianthe (1813–1876)
- Ianthe, love interest of the main character in John William Polidori's The Vampyre
- Ianthe, character in Roelstra's Line in the Dragon Prince series
- Ianthe, character in An Unsuitable Attachment, a posthumous work by Barbara Pym
- Ianthe, character in Sylvester, or the Wicked Uncle, a 1957 book by Georgette Heyer
- Ianthe, character in A Court Of Mist And Fury, 2016 book by Sarah J. Maas
- Ianthe, character in House of Names, 2017 book by Colm Tóibín
- Ianthe, spirit in "Al Aaraaf," 1829 poem by Edgar Allan Poe
- Ianthe, character in The Locked Tomb series by Tamsyn Muir
Biology
- Ianthe, a genus of isopods formerly known as Tole
- Kylix ianthe, a sea snail in the family Drilliidae
- Pieris ianthe; see Belenois hedyle
- Dichomeris ianthes; see Dichomeris acuminata
- Pseudoneptis bugandensis ianthe; see Pseudoneptis
Other
- Lake Ianthe, a lake on the West Coast of New Zealand 's South Island
- 98 Ianthe, a main belt asteroid
- Ianthe, Trademark owned by Ian Heath Ltd of Birmingham, England in silverware goods.
- Ianthe, fabric and leatherwork pattern owned by Liberty of London Co.