BU, Bu and variations may refer to:
Buddhism (, US also ) is the world's fourth-largest religion with over 520 million followers, or over 7% of the global population, known as Buddhists.
Bulgaria ( (listen); Bulgarian: България, translit. Bǎlgariya), officially the Republic of Bulgaria (Bulgarian: Република България, tr.
Buenos Aires ( or ; Spanish pronunciation: [ˈbwenos ˈaiɾes]) is the capital and largest city of Argentina.
Budapest (, Hungarian pronunciation: [ˈbudɒpɛʃt]) is the capital and the most populous city of Hungary, and the tenth-largest city in the European Union by population within city limits.
Bupropion, sold under the brand names Wellbutrin and Zyban among others, is a medication primarily used to treat major depressive disorder and to support stopping smoking.
Buzz Aldrin (; born Edwin Eugene Aldrin Jr.; January 20, 1930) is an American engineer and a former astronaut and fighter pilot.
Burton Leon Reynolds Jr. (February 11, 1936 – September 6, 2018) was an American actor, director and producer.
Buffalo is the second largest city in the U.S. state of New York and the largest city in Western New York.