OBB may refer to: ÖBB, Austrian Federal Railways OBB (band), a Christian pop rock band Oliver B. Bumble, comic series and name of its main character Opaque binary blob, a file format, which is (among others) used by the Android operating system Open Buy Back, a security Oriented bounding box, a type of bounding volume used in computer geometry OTC Bulletin Board, a regulated quotation service for stocks that are not listed on one of the major U.S. stock exchanges Opening Billboard or title sequence