The Paris Memorandum of Understanding (MoU) on Port State Control is the official document in which 27 participating Maritime Authorities agree to implement a system of Port State Control.

The current member States of the Paris MoU are:
Belgium, Bulgaria, Canada, Croatia, Cyprus, Denmark, Estonia, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Latvia, Lithuania, Malta, the Netherlands, Norway, Poland, Portugal, Romania, the Russian Federation, Slovenia, Spain, Sweden and the United Kingdom

Mission is to eliminate the operation of sub-standard ships through a harmonized system of Port State control.

Annually more than 18.000 inspections take place on board foreign ships in the Paris MoU ports, ensuring that these ships meet international safety, security and environmental standards, and that crew members have adequate living and working conditions.

Basic principle is that the prime responsibility for compliance with the requirements laid down in the international maritime conventions lies with the shipowner/operator.
Responsibility for ensuring such compliance remains with the flag State.