- (the) Australian Capital Territory (ACT)
- the avant-garde
- the back of beyond
- the Badminton Horse Trials
- the bad old days
- the Bahamas
- (the) Bahamas
- the balance of evidence
- the balance of evidence/probability
- the balance of probability
- the Balkans
- the ball is in sb's court
- the ball is in your court
- the ball is in your/ court
- the ball is in your/sb's court
- the bare bones
- the bare bones of
- the bare bones (of sth)
- the battle lines are drawn
- the BBC World Service
- the beachfront
- the be-all and end-all
- the be-all and end-all of
- the be-all and end-all (of sth)
- the beat generation