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OHDOff Hook Delay
OHDOutlook Help Desk
OHDOptical Hard Drive
OHDOffice of Hydrologic Development (US NOAA)
OHDOregon Health Division
OHDOverhead Door
OHDOld High Denomination (bank notes)
OHDOh Happy Day (song)
OHDOrganic Heart Disease
OHDOhrid, Macedonia - Ohrid (Airport Code)
OHDOff-Hook Delay
OHDOxnard Harbor District (Canada)
OHDOrascom Hotel and Development (Cairo, Egypt)
OHDOver-the-Horizon Detection
OHDOnline Hard Drive
OHDObsessive Highlighting Disorder
OHDObsessional Hyclic Disorder (psychology)