“One reads alone, even in another's presence.”
- 1946 – L'Unità Prize (shared with Marcello Venturi) for the short story, Minefield (Campo di mine)
- 1947 – Riccione Prize for The Path to the Nest of Spiders
- 1952 – Saint-Vincent Prize
- 1957 – Viareggio Prize for The Baron in the Trees
- 1959 – Bagutta Prize
- 1960 – Salento Prize for Our Ancestors
- 1963 – International Charles Veillon Prize for The Watcher
- 1970 – Asti Prize
- 1972 – Feltrinelli Prize for Invisible Cities
- 1976 – Austrian State Prize for European Literature
- 1981 – Legion of Honour[51]
- 1982 – World Fantasy Award – Life Achievement