OBA

Oba or OBA may refer to:

==Science, technology, business, management== Office Business Applications, software which uses applications within the Microsoft Office system On base average, a baseball statistic Online Behavioral Advertising, a range of technologies and techniques used by online website publishers and advertisers Optical Brightening Agent, a type of dye used in fabric and paper Output-based aid, a type of aid to support the delivery of public services in developing countries Out-of-band agreement, in communications Oxygen Breathing Apparatus, an oxygen supply system used by the US Navy for firefighting