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OHAOffice of Hawaiian Affairs
OHAOffice of Hearings and Appeals (US federal government)
OHAOntario Hockey Association (Canada)
OHAOpen Handset Alliance
OHAOntario Hospital Association
OHAOhio Hospital Association
OHAOtis Historical Archives (est. 1968; National Museum of Health and Medicine)
OHAOral History Association
OHAOverseas Housing Allowance
OHAOakland Housing Authority (Oakland, CA)
OHAOral Health America
OHAOffice of Health Affairs
OHAOmaha Housing Authority
OHAOffice of Historic Alexandria (Alexandria, VA)
OHAOncology Hematology Associates (Newburgh, IN)
OHAOrkney Housing Association (UK)
OHAOdorous House Ant (insect)
OHAOakland Heritage Alliance (Oakland, CA)
OHAOrlando Housing Authority
OHAOntario Horticultural Association (Canada)
OHAOak Hill Academy
OHAOntario Homeopathic Association (Canada)
OHAOklahoma Heritage Association
OHAOral Hypoglycaemic Agent
OHAOld Harveians' Association (UK; alumni group)
OHAOntario Health Association (Canada)
OHAOutdoor Household Articles
OHAOccupational Health Assessment (NIOSH)
OHAOperations Hazard Analysis
OHAOcala Housing Authority
OHAOctavia Hill Association, Inc.
OHAOrganization for Humanitarian Assistance
OHAO'Hara Hall (University of Scranton)
OHAOperating/Operational Hazard Analysis
OHAOhio Halfway House Association (now Ohio Community Corrections Association)
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