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

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