B
- Sullivan Ballou, Union Soldier during the American Civil War (graduated 1849)
- Charles Barber, author writing on mental health and psychiatry
- John Barres, current Roman Catholic bishop of Allentown
- James Phinney Baxter, former President of Williams College and Pulitzer Prize winner (graduated 1918)
- Willow Bay, CNN news anchor (graduated 1981)
- Bill Belichick, coach of New England Patriots. (graduated 1971)
- James Bell, New Hampshire politician and lawyer
- Michael Beschloss, historian (graduated 1973)
- Hiram Bingham III, Archaeologist; rediscovered ancient ruin of Machu Picchu in Peru (graduated 1894)
- H.G. "Buzz" Bissinger, author of Friday Night Lights and Pulitzer Prize winning journalist (graduated 1972)
- Les Blank, award-winning independent documentary film maker (graduated 1954)
- Humphrey Bogart, actor (1918) (Expelled)
- L. Paul Bremer, (graduated 1959)
- Johnny Broaca, Former MLB player (New York Yankees, Cleveland Indians)
- Richard Brodhead, President of Duke University (graduated 1964)
- Edgar Rice Burroughs, author (Student until 1894) (Transferred to MMA)
- George H. W. Bush, 41st U.S. President (graduated 1942)
- George W. Bush, 43rd U.S. President (graduated 1964)
- Jeb Bush, Governor of Florida (graduated 1971)
Read more about this topic: List Of Phillips Academy Alumni