Octa may refer to: Places Octa, Missouri Octa, Ohio People Octa of Kent (6th century), king of Kent Other uses Octa (unit), a proposed unit of information by Donald Knuth denoting 64 bit Office of the Chief Trade Adviser Orange County Transportation Authority Oregon-California Trails Association Oregon Cannabis Tax Act Overseas Countries and Territories Association Optical coherence tomography angiography, an imaging modality for visualizing vasculature Octa-, a prefix meaning eight See also Okta (disambiguation)