A voluntary lien that is established on matters without handing over property to the creditor and which does not entitle him to hold the pledge is a mortgage. A mortgage is a type of lien that, as a rule, is based on real estate. The property must be in legal circulation and there must be a possibility of liquidaton. In order to secure a single claim, there can be a common (simultaneous) mortgage, which means that the mortgage can be burdened with several properties on different land registry inserts as if all these properties together are one thing, one pledge. The mortgage is registered in the land registry office, the property on which the pledge is established. Application for a mortgage in the land registry is conducted by the competent authority, i.e. the local competent Municipal Court, on the basis of the Pledge Agreement, the court record on the establishment of the mortgage or on the basis of a notarial document. Upon submission of the application, the competent authority shall carry out the procedure of registration of the mortgage in the land registry. After the registration process all information related to the mortgage, entered in the land registry, becomes publicly available. This paper deals with the topic of lien in general, with a special emphasis on mortgage and its registration in the land registry. Different types of land registry entries and conditions for registration of the mortgage, as well as the content of such an entry, are considered. Also, the powers and duties arising from the lien for the mortgage creditor and the mortgage debtor in relation to the pledged immovable property are described. The paper also discusses the write-off procedure with load transfer and zero mortgage write-off. Furthermore, the subject of the supermortgage shall be addressed and a detailed explanation shall be given of the termination of the lien, the settlement of the secured claim and the depreciation process.