Levi-Civita was elected an international honorary member of the American Academy of Arts and Sciences in 1917. The Royal Society awarded him the Sylvester Medal in 1922 and elected him as a foreign member in 1930. He became an honorary member of the London Mathematical Society, of the Royal Society of Edinburgh, and of the Edinburgh Mathematical Society, following his participation in their colloquium in 1930 at the University of St Andrews. He was also a member of the Accademia dei Lincei, the Pontifical Academy of Sciences, and the American Philosophical Society.