BB, Bb (or similar) may refer to:

• Bavarian Peasants' League or BB, a former German political party
• BB Bloggingsbooks, an imprint of the German group VDM Publishing
• BlackBerry Limited, a Canadian software and telecommunications company
• Boys' Brigade, an international non-denominational Christian youth organization
• Banco do Brasil S.A., largest Brazilian and Latin American bank by assets
• Best Buy, a electronic store, that some call BB or Best B.
• Brooks Brothers, an American clothier

.bb is the Internet country code top-level domain (ccTLD) for Barbados. The .bb top-level domain has been maintained by several administrators since its creation. The first of which was the University of Puerto Rico. In 1996 the Government of Barbados sought the relegation of .bb to the incumbent local exchange carrier, Cable & Wireless (BARTEL) Ltd. A 2001 Memorandum of Understanding was then later signed between the Government of Barbados and both Cable & Wireless (Bartel) Ltd. and its sister company Cable & Wireless (BET) Ltd., to continue the administration of the ".bb" domains until the government selected alternate directives. In November, 2007 .bb was again relegated to the Telecoms Unit within the Government of Barbados.