HM or hm may refer to:

Arts and entertainment

* ''HM'' (magazine), a Christian hard rock magazine * Hidden Machine, a type of item in Pokémon

Businesses

* H&M, a Swedish clothing company *

Hindustan Motors Hindustan Motors is an Indian automotive manufacturer based in Kolkata, West Bengal, India. It is a part of the Birla Technical Services conglomerate. The company was the largest car manufacturer in India before the rise of Maruti Udyog. Hind ...

, an automobile manufacturer of India * Air Seychelles (IATA airline code)

Other uses

Heard Island and McDonald Islands The Territory of Heard Island and McDonald Islands (HIMI) is an Australian external territory comprising a volcanic group of mostly barren Antarctic islands, about two-thirds of the way from Madagascar to Antarctica. The group's overall size ...

(ISO 3166 digram and FIPS PUB 10-4 territory code) **

.hm .hm is the Internet country code top-level domain ( ccTLD) of the Heard and McDonald Islands, uninhabited islands in the southern Indian Ocean under the sovereign control of Australia. Although .hm gets a small amount of use, Australia uses the ...

, the Internet country code top-level domain ostensibly for the above *

Hectometre The hectometre ( International spelling as used by the International Bureau of Weights and Measures; SI symbol: hm) or hectometer ( American spelling) is a unit of length in the International System of Units (SI), equal to one hundred metres and ...

, hm, an SI unit of length * Henry Molaison, aka Patient H.M., a man with anterograde amnesia * His or Her

Majesty Majesty (abbreviated HM for His Majesty or Her Majesty, oral address Your Majesty; from the Latin ''maiestas'', meaning "greatness") is used as a manner of address by many monarchs, usually kings or queens. Where used, the style outranks the s ...

, a form of address for various monarchs * Hindley–Milner type system, in mathematics *

Hospital corpsman A hospital corpsman (HM r corpsman is an enlisted medical specialist of the United States Navy, who may also serve in a U.S. Marine Corps unit. The corresponding rating within the United States Coast Guard is health services technician ( ...

, in the United States Navy * Sisters of the Holy Humility of Mary's postnominal initials {{disambiguation