HMDS

HMDS may refer to:


 * either of two related reagents in organometallic chemistry:
 * Hexamethyldisilazane ([(CH3)3Si]2NH)
 * Hexamethyldisilazide ([(CH3)3Si]2NM)
 * M = Li as in Lithium bis(trimethylsilyl)amide (LiHMDS)
 * M = Na as in Sodium bis(trimethylsilyl)amide (NaHMDS)
 * M = K as in Potassium bis(trimethylsilyl)amide (KHMDS)
 * Hexamethyldisiloxane (O[Si(CH3)3]2)
 * Her Majesty's Diplomatic Service, of the United Kingdom
 * Helmet mounted display and sight, a system for military pilots
 * Harvest Moon DS, a video game