—Since the Internet of Things (IoT) has become more and more important, new solutions should be proposed in order to adapt the specificities introduced by this interconnection of the physical world (Sensors and Actuators) and the public networks (The Internet). Some of these solutions use a Cloud approach. The amount of data collected by Things rises the interest of the Big-Data community. The main design chosen for the IoT is the centralisation of all data collected and a central treatment of these data. But another approach is to decentralise the data processing, in order to dramatically lighten the network and limit the exchange to a reduced set of semantic messages. This decentralised architecture has assets in term of confidentiality, data ownership and energy saving. But then, how to share things among users, and keep the control? If computing is done on each object, how a user can integrate public objects in its own application, as these objects are used by some other users? How to organise access to the sensors and actuators provided by these objects? This paper proposes an architecture that gives multi-tenant capability to IoT decentralised applications, in which users are using and sharing their objects. A generic architecture is described, and integrated in our IoT platform as an example.