| H of C | House of Commons |
| HA | Historical Association; Health Authority |
| HAA | Heavy Anti-Aircraft |
| HAC | Honourable Artillery Company |
| Hants | Hampshire |
| HAT | Housing Action Trust |
| HBM | His/Her Britannic Majesty (Majesty's); Humming Bird Gold Medal (Trinidad) |
| HC | High Commissioner |
| HCSC | Higher Command and Staff Course |
| HE | His/Her Excellency; His Eminence |
| HEA | Health Education Authority |
| HEC | Ecole des Hautes Etudes Commerciales; Higher Education Corporation |
| HEFCE | Higher Education Funding Council for England |
| HEIC | Honourable East India Company |
| HEICS | Honourable East India Company's Service |
| Herefs | Herefordshire |
| Herts | Hertfordshire |
| HG | Home Guard |
| HH | His/Her Highness; His Holiness; Member, Hesketh Hubbard Art Society |
| HHA | Historic Houses Association |
| HHD | Doctor of Humanities (US) |
| HI | Hawaii |
| Highrs | Highlanders |
| HIH | His/Her Imperial Highness |
| HIM | His/Mer Imperial Majesty |
| Hist. | History, -orical |
| Hldgs | Holdings |
| HLI | Highland Light Infantry |
| HM | His/Her Majesty |
| HMAS | His/Her Majesty's Australian Ship |
| HMC | Headmasters' and Headmistresses' (formerly Headmasters') Conference; Hospital Management Committee |
| HMCS | His/Her Majesty's Canadian Ship |
| HMOCS | His/Her Majesty's Overseas Civil Service |
| HMS | His/Her Majesty's Ship |
| HNC | Higher National Certificate |
| Ho | House |
| Ho Lds | House of Lords |
| Hon | Honourable; Honorary |
| Hons | Honours |
| Hosp | Hospital |
| HQ | Headquarters |
| HRE | Holy Roman Empire |
| HRGI | Honorary Member, The Royal Glasgow Institute of the Fine Arts |
| HRH | His/Her Royal Highness |
| HRSA | Honorary Member, Royal Scottish Academy |
| HS | High School |
| HSC | Health and Safety Commission |
| HSE | Health and Safety Executive |
| HSH | His/Her Serene Highness |
| Hts | Heights |
| Hum | Humanity, Humanities (Classics) |
| Hunts | Huntingdonshire |
| Hus | Hussars |
| Hy | Heavy |