M
Flag
Company
Country
MATCO Tankers (U.K.) Ltd, London
UK
Micronesian Interocean Lines Inc., Saipan
Micronesia
Thames & Medway Towing Co., London

white burgee, black "M"; the "M" is formed so, that two "T's" can be visualised.

UK
Misje Norway
Märkische Transportgesellschaft (seat: Berlin).

The name essentially means "Brandenburg Transport Company".

Germany
E. A. Moreira, Agentes de Navegação, S. A. Portugal
Merchants Line for New Orleans United States
Bremer Reederei Merkur GmbH
Germany
Matthies Reederei, Hamburg
Germany
A/S Mosvolds Rederei Norway
Christian Michael Matzen Germany
Mezeron Ltd
Isle of Man
Montan Shipping GmhH & Co KG Germany
Meyrose Germany
Medorient Shipping Lines GmbH., Hamburg
Germany
Reederei Ferdinand Müller Germany
J.E. Manne
Sweden
Iraqui Maritime Transport Co., Baghdad

vertical VWV flag; in center intertwined black "M", red "Hora", the legendary bird of Iraq.

Flag adopted in 1971.

Iraq
Matarazzo Brazil
Barkassen Meyer Germany
‘Gebr. Meyer Bauunternehmung GmbH & Co.’, Cologne
(i.e. Meyer Brothers Construction Company, Ltd)
Germany
Montella, Naples
Italy
Willem Muller Zeesleepdienst Netherlands
Moore & Co
UK
Misener Holdings Ltd., St. Catherine's, Ont
Canada
Mihei Shipping & Trading Romania
COSCO China
A/B Coastal Tanker Sweden
Chemveg AB Sweden
Argo Mann Ferry service Germany
Malmros Rederi AB
Sweden
Metro Meat Ltd. Australia
Karl Meyer, Wischhafen

white flag, stylized "M", pierced by a double-pointed red arrow.

Germany
Merkur Schiffahrt – Baustoffe GmbH Germany
Kustvaartbedrijf Moerman B.V., Schiedam
Netherlands
Minuano Navegação S.A., Rio Grande do Sul
Brazil
Navigazione Montanari
Italy