A large number of maritime claims, are entitled to a legal protection that is established at the time of creation of the claim and subsequently, maritime lien in favour of the creditor. National regulations of maritime liens, dates back to ancient laws and customs and In order to removing differences of theses regulations, some international conventions on unification of certain rules relating to maritime liens, have been adopted. Maritime lien, create rights of priority and prosecution for the creditor .so, it is naturally a kind of security or encumbrance. In this research, the concept and nature of maritime lien is studied and meanwhile, we study, critically, Iranian maritime Act which, there is confusion in some of its sections between the concept and nature of (maritime claim) and (maritime lien).
)