HDMS may refer to:
* ''His/Her Danish Majesty's Ship'' (in Danish, ''KDM''), ship prefix for Denmark's
Royal Danish Navy
The Royal Danish Navy ( da, Søværnet) is the sea-based branch of the Danish Defence force. The RDN is mainly responsible for maritime defence and maintaining the sovereignty of Danish territorial waters (incl. Faroe Islands and Greenland). O ...
*
Hexamethyldisilazane, chemical reagent
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