* [[Anton Ackermann]] — Leader of the Political School of the International Brigades.
* [[Todor Angelov]] — Bulgarian [[Anarchist communism|anarcho-communist]]
▲* [[Akseli Anttila]] — Finnish-born Soviet general
* [[Shapour Bakhtiar]] — last Prime Minister of Iran under the [[Pahlavi dynasty]]
*[[Norman Bethune]] — Canadian physician with the mobile blood transfusion unit.▼
* [[Hans Beimler (Communist)|Hans Beimler]] — After his death, the XI International Brigade was named in his honor.
▲* [[Norman Bethune]] — Canadian physician with the mobile blood transfusion unit.
* [[Herman Bottcher]] — two-time winner of the [[Distinguished Service Cross (United States)|Distinguished Service Crosses]] during World War II
* [[Boulting Brothers|John Edward Boulting]] — English filmmaker, ambulance driver<ref>{{cite book|title=The New York Times Biographical Service|url=https://books.google.com/books?id=ots1AQAAIAAJ|date=July 1985|publisher=University Microfilms}}</ref><ref name="BurgessTurner1988">{{cite book|author1=Patricia Burgess|author2=Roland Turner|title=The Annual Obituary|url=https://books.google.com/books?id=70sYAAAAIAAJ|year=1988|publisher=St. Martin's}}</ref>
* [[Willy Brandt]] — West German Chancellor from 1969 to 1974, Nobel Peace Prize winner, leader of the [[Socialist International]]
* [[Ernst Busch (actor)|Ernst Busch]] — singer of broadcast battle songs - "Voice of the XI Brigade"
