Daniel R. Day (born August 8, 1944), known as Dapper Dan, is an American fashion designer and haberdasher from Harlem, New York.

His store, Dapper Dan's Boutique, operated from 1982 to 1992 and is most associated with introducing high fashion to hip hop culture; its clientele includes Mike Tyson, Eric B. & Rakim, Salt-N-Pepa, LL Cool J, and Jay-Z. In 2017, he launched a fashion line with Gucci, with whom he opened a second store and atelier, Dapper Dan's of Harlem, in 2018.