B blue
Flag
Company
Country
Schiffahrts Braack K.G., Drochtersen
Germany
Ventouris Group Enterprises S.A., Piraeus
Greece
S.M. Valmadis, Syra
Greece
Ångf. A/B Bore
Finland
Bereincua Hermanos S.L.
Spain
Haryy Borthen & Co., A/S, Oslo
Norway
Aktieselskabet Borgestad ASA Norway
Petter Y. Berg, Drammen
Norway
Bull Line (A.H. Bull Line) United States
A. Bangert Germany
Ivar Bugge Management A/S, Larvik
Norway
VEB Bagger-, Bugsier- und Bergungsreederei 
East Germany
Th. Brovig, Farsund
Norway
Habo Shipping Company BV (Rotterdam) Netherlands
Den Breejen, Zierikzee
Netherlands
Rex Shipping Corp. (L. Th. Voyazides), Athens
Greece
Hermann Buss, Leer

white flag, blue stylized "B" between two East-Frisian flags

Germany
Beoplov, Belgrad
Serbia-Montenegro
Blaesbjerg Marine (Aarhus)
Denmark
Bona Shipholding Norway
Ballin's Dampfschiff-Rhederie-Gesellschaft Germany
Booth Steamship Company, Limited, Liverpool
UK
Société Anonyme "Baltique" (Giani & Muller), Antwerp
Belgium
Blakes Holiday Boating
UK
Bocimar S.A., Temse
Belgium
Busck, Marseille
France
Brijder Harlingen BV Netherlands
Bocimar International
Belgium
Bijma companies, Zuidbroek
Netherlands
Bestevaer.
 The "B" is shown as blue by Handboek voor Scheepvaartbelangen in Nederland (1917).
Netherlands