XMS may refer to: Cray XMS, a vector processor minisupercomputer eBuddy XMS, instant-messaging service ISO 639:xms, Moroccan Sign Language Macas Airport (IATA: XMS), Ecuador XMS Capital Partners, a global financial services firm eXtended Memory Specification, an application programming interface for storing data in extended memory on IBM PC systems XMS, an API offered by IBM WebSphere MQ See also XM 5 (disambiguation) XM (disambiguation)