16, is an opera in one act by Alexander von Zemlinsky composed in 1915–16 to a libretto adapted by the composer from a German translation by Max Meyerfeld [de] of Oscar Wilde's unfinished play A Florentine Tragedy.

The opera was premiered at the Staatsoper Stuttgart on 30 January 1917 under the direction of Max von Schillings.

The work was also staged in Leipzig (1922), Aachen (1924), Schwerin (1925), and Freiburg im Breisgau (1927).

[2][3] Simone, a Florentine merchant, suspects that he is being cuckolded by Prince Guido whom he discovers at home with his wife Bianca on returning from a business trip.

Bianca, admiring her husband's strength, rushes to embrace him and the two are reconciled as the curtain falls.