Fleur Jaeggy (born 31 July 1940) is a Swiss author who writes in Italian.
The Times Literary Supplement named her novel Proleterka a Best Book of the Year upon its publication in the United States, and her Sweet Days of Discipline won the Premio Bagutta and the Premio Speciale Rapallo.
After completing her studies in Switzerland, she went to live in Rome, where she met Ingeborg Bachmann and Thomas Bernhard.
In 1968, she went to Milan to work for the publisher Adelphi Edizioni and married Roberto Calasso.
Jaeggy worked with the Italian musician Franco Battiato under the pseudonym of Carlotta Wieck.