RV9

RV9 may refer to:
 * Mandala 9, the ninth mandala of the Rigveda
 * Norwegian National Road 9 (Norwegian: Riksvei 9)
 * RealVideo 9, a video codec
 * Van's Aircraft RV-9, a kit aircraft
 * Sonata No. 11 in D Major, RV 9, from Antonio Vivaldi's Twelve Trio Sonatas, Op. 2