B
- Benjamin Allen (politician), Canadian politician
- Bernadette Allen, U.S. diplomat
- Bernard Allen (Irish politician) (born 1944)
- Bernard Allen (U.S. politician) (1937–2006)
- Bob Allen (Florida politician) (born 1958), Representative of District 32 in the state of Florida
- Bob Allen (1960s pitcher), American League pitcher (1961–1967)
- Bob Allen (basketball) (born 1946), American basketball player
- Bob Allen (shortstop) (1867–1943), American baseball player and manager
- Bobby Allen (born 1978), American hockey player
- Bradley Allen (born 1971), English footballer
- Bruce Allen (manager), Canadian manager of musical artists
- Bruce Allen (physicist) (born 1959), American physicist; director of the Max Planck Institute for Gravitational Physics
- Bryan Allen (hang glider) (born 1952)
- Bryan Allen (ice hockey) (born 1980), Canadian hockey player
- Bryn Allen (1921–2005), Welsh international footballer
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