OHA
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:

 nia
 Ugo Oha, a Nigerian basketball player
 Ofe Oha, a Nigerian soup