BD, Bd or bd may refer to:
BDO is an international network of public accounting, tax and advisory firms which perform professional services under the name of BDO.
The relationship between BDSM and the law changes significantly from nation to nation. It is entirely dependent on the legal situation in individual countries whether the practice of BDSM has any criminal relevance or legal consequences.
The Bi-Digital O-Ring Test (BDORT), characterized as a form of applied kinesiology, is a patented alternative medicine diagnostic procedure in which a patient forms an 'O' with his or her fingers, and the diagnostician subjectively evaluates the patient's health according to the patient's finger strength as the diagnostician tries to pry them apart.
BD+ is a component of the Blu-ray Disc Digital Rights Management system. It was developed by Cryptography Research Inc.