No. 21 F/W 17 is a runway show for the brand No. 21, designed by Alessandro Dell'Acqua. The show took place on February 22, 2017, during Milan Fashion Week F/W 17 Women's. It featured a cast of 39 models, with Kiki Willems opening the show and Sarah Berger closing it. The casting directors for this show were Barbara Nicoli and Leila Ananna.