Esther Vanhomrigh or Van Homrigh (known by the pseudonym Vanessa; c. 1688 – 2 June 1723), an Irish woman of Dutch descent, was a longtime lover and correspondent of Jonathan Swift. Swift's letters to her were published after her death. Her fictional name "Vanessa" was created by Swift by taking Van from her surname, Vanhomrigh, and adding Esse, the pet form of her first name, Esther.
She was fictionalized as "Vanessa" in Swift's poem Cadenus and Vanessa (1713). In the poem, he wrote:
- Each girl, when pleased with what is taught,
- Will have the teacher in her thought.