OBG is an initialism for Ormeau Baths Gallery in Belfast, Northern Ireland.
OBG may also refer to:
OBG/OBGYN, surgical–medical specialties dealing with the female reproductive organs OBG(W), Overwatch Battle Group (West), an Australian Army battlegroup OBG Ltd v Allan, a case on economic torts in English law Odesa Botanical Gardens, Ukraine Ofer Brothers Group, an Israeli family business Oprah's Big Give, a reality television series hosted by Nate Berkus Operation Board Games, a 2003 federal fraud investigation O.B.G., Overmassive black hole galaxy