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- John Boler - Chairman, President & CEO, Boler Co.; see Hendrickson International (John Carroll University)
- Jack Breen - former CEO, Sherwin-Williams (John Carroll University)
- Claude Bachet - French mathematician (pupil of the Jesuit mathematician Jacques de Billy at the Jesuit College in Rheims)
- Mohsen Badawi - Egyptian entrepreneur, political activist and writer (Collège de la Sainte Famille)
- Fr. Eugene Balabin, SJ - Russian Catholic priest, collaborator with Martynov and Gagarin, developer of Jesuit "Slavic" Library at Meudon (attended seminary at Vals near Le-Puy-en-Velay)
- Jakob Balde - German Latinist and poet (University of Ingolstadt)
- José Celso Barbosa - medical doctor, sociologist, and political leader (first racially mixed resident to attend Puerto Rico's Jesuit Seminary)
- George Barna - American political pollster (Boston College)
- Kevin Barry - martyr of the Irish War of Independence (Belvedere College)
- John Barrymore - American Shakespearean actor (Georgetown Preparatory School)
- Jyoti Basu - Communist politician from West Bengal, India (St. Xavier's Collegiate School)
- Elgin Baylor - American basketball player, (Seattle University)
- Steve Bellan - Cuban baseball player (Fordham University)
- Tom Benson - New Orleans Saints owner (Loyola University New Orleans)
- Saint Robert Bellarmine - (Gregorian University)
- Pope Benedict XIV - Italian Pope (Collegium Clementianum)
- Robert Bennett - prominent Washington, D.C. attorney (Brooklyn Prep, Georgetown College, Georgetown University School of Law)
- William Bennett - former US Secretary of Education and author (Gonzaga College High School)
- Joseph Berardino - former CEO of Arthur Andersen (Fairfield University)
- Fr. Daniel Berrigan, SJ - peace activist, author and professor, Woodstock College (Brooklyn Prep, Le Moyne College, Fordham University)
- Philip Berrigan - author and activist (College of the Holy Cross)
- Rubén Berríos - President of the Puerto Rican Independence Party (Colegio San Ignacio de Loyola of Puerto Rico)
- Sabeer Bhatia - Founder of Hotmail (St Joseph's College, Bangalore, India)
- Jacques de Billy - French Jesuit mathematician
- Daniel Birman Ripstein - film producer (Universidad Iberoamericana)
- William Peter Blatty - American author (Brooklyn Prep and Georgetown University)
- Georg Freiherr von Boeselager - German officer (Aloisiuskolleg)
- Philipp Freiherr von Boeselager - German officer (Aloisiuskolleg)
- Fr. Jean Bolland, SJ - educator, scholar, researcher, hagiographer, founder of the Bollandists, original editor and author of the Acta Sanctorum (Jesuit colleges at Maastricht and Antwerp, Louvain)
- Jean-Charles de Borda - French mathematician, physicist, political scientist and sailor (Jesuit college at La Fleche)
- Gutzon Borglum - American sculptor (Creighton Preparatory School)
- Roger Boscovich - Croatian Jesuit astronomer (Jesuit College in Ragusa)
- Charles Bossut - French mathematician, confrere of the Encyclopaedists (Jesuit College of Lyon)
- Robert Bourassa - Quebec politician, (College Jean-de-Brebeuf, Montreal)
- Jacques-Bénigne Bossuet - French bishop and theologian (Collège des Godrans)
- Isaac Broid Zajman - Mexican architect (Universidad Iberoamericana)
- Till Brönner - German musician (Aloisiuskolleg in Bonn, Germany)
- Prof. Brendan F.X. Brown - American jurist, philosopher, prosecutor, professor, natural law expert (Creighton University and Creighton University School of Law)
- Jerry Brown - American politician (St. Ignatius High School and Santa Clara University)
- Christopher Brennan - Australian author (St Ignatius' College, Riverview, Sydney)
- John O. Brennan - US Deputy National Security Advisor for Homeland Security (Fordham University)
- Carlos Brito - CEO, InBev (educated by Jesuits in his native Brazil)
- John Bruton - former Taoiseach of Ireland (Clongowes Wood College)
- Zbigniew Brzezinski - Polish American political scientist, geostrategist, United States National Security Advisor (Loyola High School)
- Pat Buchanan - American journalist (Gonzaga College High School and Georgetown University)
- William F. Buckley, Jr. - American author, conservative commentator and public intellectual (Beaumont College in England)
- Clara de Buen Richkarday - Mexican architect (Universidad Iberoamericana)
- Georges Buffon - French naturalist, mathematician, biologist, cosmologist and author (Jesuit College of Godrans in Dijon)
- Jim Bunning - American senator and baseball player (Xavier University)
- Luis Buñuel - Spanish filmmaker (Jesuit College, Aragon, Spain)
Read more about this topic: List Of Alumni Of Jesuit Educational Institutions