O
Flag
Company
Country
Oregon Steamship Co. Ltd, London.
UK
Oceania - Sušak
Croatia
C.A. Olsen Norway
Oriental Exporters, Inc. United States
O.M.I. Corp., New York
United States
Albert Evers und Classen
Germany
Boyd & Hincken United States
Sverige-Levanten Akt. (Dan Brostrom), Gothenburg
Sweden
Carnival Cruise Lines, Inc.
Carnival Cruise Lines
Panama
United States
Fredrik Olsson & Co Sweden
Orion Expedition Cruises Pty. Ltd. Australia
Ore SS Co. United States
Oosterwijk Netherlands
Oranje Verzekeringen

(different forms of flag or pennant)

Netherlands
N.V. Stoomvaart-Maatschappij "Oostzee" (= Baltic sea), Amsterdam Netherlands
Syndikats Rhederei Gesellschaft, Hamburg
Germany
Ofotens Dampskipsselskap A/S Norway
Othello Shipping Co. Denmark
Orion Bulkers GmbH & Co. KG
Germany
Olea Tankschiffahrtsges. mbH Germany
Compagnie de Navigation d'Orbigny
France
Bilgenentölungsgesellschaft mbH Germany
Rhederei A.-G. 'Oceana' Germany
Oscar Ott Germany
D. Oltmann & Co., K.G., Bremen
Germany
Orion Rederierne A/S (Copenhagen)
Denmark
AB Kungsoil
Sweden
Ofoten & Vesteraalens D/S A/S, Narvik
Norway
Oceanic Steamship Company  United States
Oosse Maritiem BV Netherlands
Orient Shipping Line Palestine Palestine
Reederei Ges(chwister?) Gerhard Oltmann K.G., Drochtersen
Germany
Pickenpack Fishing company Germany
Oudkerk BV Netherlands