HM
- HM – (s) Heard Island and McDonald Islands (ISO 3166 digram; FIPS 10-4 territory code)
- H/MAD – (p) High/Medium Altitude Air Defence ("aytchmad"; see also HIMAD)
- HMCE – (i) Her Majesty's Customs and Excise
- HMCS – (i) Her Majesty's Canadian Ship or Her Majesty's Courts Service
- HMD – (s) Heard and McDonald Islands (ISO 3166 trigram)
- HMF – (p) HydroxyMethyl Furfural
- HMM – (i) Hidden Markov model
- HMMWV – (i) High Mobility Multipurpose Wheeled Vehicle ("hum-vee"; "hummer")
- hmo – (s) Hiri Motu language (ISO 639-2 code)
- HMO – (i) Health maintenance organization
- HMP – (i) Her Majesty's Prison
- HMS – (i) Helmet-mounted display – Her Majesty's Ship (Royal Navy)
- HMSO – (i) Her Majesty's Stationery Office
- HMV – (i) His Master's Voice
Read more about this topic: List Of Acronyms And Initialisms: H