Bab (toponymy), a component of Arabic toponyms literally meaning "gate"
Set (mythology) (also known as Bab, Baba, or Seth) ancient Egyptian God
Bab (Shia Islam), a term designating deputies of the Imams in Shia Islam
Báb (Sayyid `Alí Muḥammad Shírází, 1819–1850), founder of Bábism and a central figure in the Bahá'í Faith
Bab-ı Âli, the gate to the palace of the Grand vizier of the Ottoman Empire
Báb, Nitra District, a village and municipality in the Nitra District in western central Slovakia
Bab Ballads, cartoons published by W. S. Gilbert under the childhood nickname, Bab
Back-arc basin, a geologic feature: a submarine basin associated with island arcs and subduction zones
"Base Attack Bonus", a term used in d20 System RPG games
Beale Air Force Base (IATA airport code: BAB), in California
Biotechnology and Applied Biochemistry, an academic journal
Boris Berezovsky (businessman) (1946–2013), Boris Abramovich Berezovsky, a powerful Russian oligarch in self-imposed exile in London from 2001
Build America Bonds, a type of municipal bond created by the American Recovery and Reinvestment Act of 2009
Bunty Aur Babli, a 2005 Indian film
Bundesautobahn (BAB), federal motorways in Germany
B. A. Baracus, character on 1980s action series The A-Team
The British Aikido Board, a federation of independent Aikido associations within the United Kingdom
British Agriculture Bureau, the Brussels office of the National Farmers' Union of England and Wales, National Farmers' Union of Scotland, and Ulster Farmers' Union
Babcock International (stock symbol BAB)
Balcombe railway station, a railway station in Sussex, England