- Na aka Mgbe niile Ụlọ ọrụ DHS nke Health Affairs, ụlọ ọrụ dị na Ngalaba Nchebe Obodo United States Oakland Heritage Alliance, otu nchekwa anaghị akwụ ụgwọ na Oakland, California. Oakland Housing Authority Ụlọ ọrụ Hawaiian Affairs Ọfịs nke Ntị na Mkpegharị, n'ime nchịkwa obere azụmaahịa US Office of Human Affairs, Community Action Agency na-ejere ndị bi na Newport News na Hampton, Virginia ozi. Oklahoma Hospital Association, Mgbakwunye steeti nke American Hospital Association Omaha Housing Authority, ụlọ ọrụ gọọmentị na-ahụ maka ịnye ụlọ ọha na Omaha, Nebraska, USA Ndị otu Hockey Ontario, nke na-achị ọtụtụ obere egwuregwu hockey na Ontario Njikọ Horticultural Ontario Njikọ Ụlọ Ọgwụ Ontario Open Handset Alliance, otu ụlọ ọrụ raara onwe ya nye maka imepụta ọkọlọtọ mepere emepe maka ngwaọrụ mkpanaka. Ndị nnọchi anya hypoglycemic nke ọnụ, ọtụtụ ọgwụ mgbochi ọrịa shuga Oral Health America Oregon Health Authority Ụlọ akwụkwọ Ormiston Horizon Oral History Association, otu ọkachamara maka ndị ọkọ akụkọ ihe mere eme ọnụ Nkwado ụlọ nke mba ofesi (Ndị agha United States) RNZAF Base Ohokea, New Zealand, nke na-eji koodu IATA OHAOn hand Always
- DHS Office of Health Affairs, an office in the United States Department of Homeland Security
- Oakland Heritage Alliance, a non-profit preservation organization in Oakland, California.
- Oakland Housing Authority
- Office of Hawaiian Affairs
- Office of Hearings and Appeals, within the US Small Business Administration
- Office of Human Affairs, a Community Action Agency serving the residents of Newport News and Hampton, Virginia.
- Oklahoma Hospital Association, the state affiliate of the American Hospital Association
- Omaha Housing Authority, the government agency responsible for providing public housing in Omaha, Nebraska, USA
- Ontario Hockey Association, which governs most junior and senior hockey in Ontario
- Ontario Horticultural Association
- Ontario Hospital Association
- Open Handset Alliance, a consortium of companies dedicated to producing an open standard for mobile devices.
- Oral hypoglycemic agents, the majority of anti-diabetic drugs
- Oral Health America
- Oregon Health Authority
- Ormiston Horizon Academy
- Oral History Association, a professional association for oral historians
- Overseas housing allowance (United States military)
- RNZAF Base Ohakea, New Zealand, which uses IATA code OHA
Oha nwere ike na-ezo aka: