17, is an opera in one act by Austrian composer Alexander von Zemlinsky to a libretto by Georg C. Klaren, freely adapted from the short story "The Birthday of the Infanta" by Oscar Wilde.

[7] In 2013, the Opéra national de Lorraine in Nancy, who had previously presented Zemlinsky's Der König Kandaules and Eine florentinische Tragödie, continued its exploration of his work with Der Zwerg, presented under the French title Le nain[8] with Erik Fenton as the Dwarf, Helena Juntuen as the Infanta, Eleanore Marguerre as Ghita and Pley Bryjak as Don Estoban.

[9] Numi Opera Theatre's inaugural season presented Der Zwerg with excerpts from Oscar Wilde's "Birthday of the Infanta" in Los Angeles in 2019.

[10] In November 2022, Cologne Opera commemorated the centenary of the work's premiere there with a new production directed by Paul-Georg Dittrich and conducted by Lawrence Renes.

[11] Offstage music: 3 trumpets; clarinet in C, bassoon, 2 horns, tambourine, mandoline, strings A sultan has sent a dwarf as a present to the Infanta (Spanish princess) Donna Clara on her birthday.