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, tr. 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 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 as an antidepressant and smoking cessation aid.
Buzz Aldrin (; born Edwin Eugene Aldrin Jr.; January 20, 1930) is an American engineer, former astronaut, and fighter pilot.
Burton Leon Reynolds Jr. (February 11, 1936 – September 6, 2018) was an American actor, director and producer.