| H/O | HandOver 
| Others |
| H/O | Head Office
| Others |
| H/O | History of
| Others |
| H/O | Hold On
| Others |
| HO | Haeme oxygenase
| Others |
| HO | Half O
| Others |
| HO | Half Of
| Others |
| HO | Half Old
| Others |
| HO | Hammer On
| Others |
| HO | Hand Out
| Others |
| HO | Hand Over
| Others |
| HO | Handeling Option
| Others |
| HO | Handing Option
| Others |
| HO | Handling Option
| Others |
| HO | Handling Options
| Others |
| HO | Hands On
| Others |
| HO | Hang Out
| Others |
| HO | Hard On
| Others |
| HO | Harmonic Order
| Others |
| HO | Harmonic Oscillator
| Others |
| HO | Harp Okulu
| Others |
| HO | Head On
| Others |
| HO | Head Or
| Others |
| HO | Health Occupations
| Others |
| HO | Health Optimizing
| Others |
| HO | Hearing Officer
| Others |
| HO | Hearing Officers
| Others |
| HO | Heating Oil
| Others |
| HO | Heckscher Ohlin
| Others |
| HO | height of
| Others |
| HO | Hellaciously Ornery
| Others |
| HO | Helper Outers
| Others |
| HO | Hematology Oncology
| Others |
| HO | Hemoccult Lab medicine, US
| Others |
| HO | Herb O
| Others |
| HO | Herb Obrien
| Others |
| HO | Herman Oliver
| Others |
| HO | Heterotopic Ossification
| Others |
| HO | High Occupancy
| Others |
| HO | High Order
| Others |
| HO | High Output
| Others |
| HO | High Overload
| Others |
| HO | High Oxygen
| Others |
| HO | Higher Option
| Others |
| HO | Higher Order
| Others |
| HO | Hike Ontario
| Others |
| HO | Holiday Offers
| Others |
| HO | Holland Oh
| Others |
| HO | Hollow Omen
| Others |
| HO | Holmium
| Element |
| HO | Home Office
| Others |
| HO | Home Owner
| Others |
| HO | Honourary Officer
| Others |
| HO | Hood Open
| Others |
| HO | Hopkins
| Others |
| HO | Horizontal Opening
| Others |
| HO | Hospitable Orifice
| Others |
| HO | Host Open
| Others |
| HO | Hostess Of
| Others |
| HO | Hot Outfit
| Others |
| HO | Hotel Of
| Others |
| HO | House Officer
| Others |
| HO | Houston Field Office
| Others |
| HO | How Ordinary
| Others |
| HO | Humanitarian Offensive
| Others |
| HO | Humanitarian Operation
| Others |
| HO | Hydraulic Optimized
| Others |
| HO | Hydrogen-Oxygen
| Others |
| HO | Hyper Offense
| Others |
| HO | Hypertrophic Osteoarthropathy
| Others |
| HO | The Hamiltonian Of
| Others |