Turandotis an opera in three acts by Giacomo Puccini, posthumously completed by Franco Alfano in 1926, and set to a libretto in Italian by Giuseppe Adami and Renato Simoni. Its best-known aria is "Nessun dorma"

The original story is one of the seven stories in the epic Haft Peykar—a work by twelfth-century Persian poet Nizami (c. 1141–1209). Nizami aligned his seven stories with the seven days of the week, the seven colors, and the seven planets known in his era. This particular narrative is the story of Tuesday, as told to the king of Iran, Bahram V (r. 420–438), by his companion of the red dome, associated with Mars. In the first line of the story, the protagonist is identified as a Russian princess. The name of the opera is based on Turan-Dokht (daughter of Turan), which is a name frequently used in Persian poetry for Central Asian princesses.