D99

D99 may refer to:
 * HMS Duncan (D99)
 * HMS Durban (D99)
 * Greek destroyer Kountouriotis (D99)
 * an ECO code for the Grünfeld Defence in chess
 * slogan of XHJD-FM radio, a CHR radio station from Monterrey, Nuevo León
 * D99 (New York City bus), a New York City Bus route in Brooklyn