9U or 9-U may refer to: 9U, IATA code for Air Moldova One of the possible sizes of a rack unit Yak-9U, a model of Yakovlev Yak-9 Su-9U, a designation of Sukhoi Su-9 9U, a type of Volkswagen Caddy 9U, Aircraft registration code for Burundi HP 9U, a Windows 3.0 version of the Windows-1252 codepage by Hewlett-Packard printers See also U9 (disambiguation)