H ~ Hotchkiss Gunner

HA ~ High Angle (munitions)

HA ~ Heavy Artillery

HAC ~ Honourable Artillery Company

HAC (ART) ~ Honourable Artillery Company Artillery

HAC (INF) ~ Honourable Artillery Company Infantry

HAG ~ Heavy Artillery Group

HAMT ~ Heavy Artillery Mechanical Transport

HAR ~ Heavy Artillery Reserve

HAT ~ Heavy Artillery Train

HBAC ~ Heavy Battery Ammunition Column

HBM ~ His Britannic Majesty

HBMGC ~ Heavy Branch Machine Gun Corps (later Tank Corps)

HBPS ~ Heavy Battery Pack Supply

HBPS ~ Heavy Battery Park Section

HD ~ Heavy Draught (horse)

HDF ~ Home Defence Force

Hdqr ~ Headquarters

Hdqrs ~ Headquarters

Hds ~ Hands (horse)

HE ~ High Explosive

HE ~ His Excellency

HE ~ Horizontal Equivalent

HF ~ Height Finder

HH ~ His Highness

HLI ~ Highland Light Infantry

HMAT ~ His Majesty's Ambulance Transport

HMAT ~ His Majesty's Australian Transport

HMDR ~ His Majesty's Drifter

HMG ~ His Majesty's Government

HMHS ~ His Majesty's Hospital Ship

HMOW ~ His Majesty's Office of Works

HMS ~ His Majesty's Ship

HMSO ~ His Majesty's Stationery Office

HMT ~ His Majesty's Transport

HMTD ~ Home Mechanical Transport Depot

HMTS ~ His Majesty's Troop Ship

hosp ~ Hospital

howr ~ Howitzer

HP ~ High Proficiency

HP ~ High Pressure

HPD ~ Home Postal Depot

Hr ~ Hussar

HRH ~ His Royal Highness

HRS ~ Heavy Repair Shop

HS ~ Higher Standard

HS ~ Home Service

HT ~ Hired Transport (shipping)

HT ~ Horse Transport

HTM ~ Heavy Trench Mortar

HTMBAIF ~ Heavy Trench Mortar Battery Australian Imperial Force

HV ~ High Velocity

HWOST ~ High Water of Ordinary Spring Tides