This deliverable presents the initial data management plan (DMP) for the starting community research infrastructure NanoCommons. It is a living document that will be updated over the course of the project, with the final plan to be delivered at the end of the project. We anticipate that at least two other versions of the plan will be developed, to accommodate the fast changing field of Open and FAIR (Findable, Accessible, Interoperable and Reusable) data in Europe. The initial DMP covers a significant part of the life cycle of research data, but cannot cover its life after the end of this project. It covers the initial process of thinking about how research data will be captured and handled during the research, networking and transnational activities (JRA, NA and TA, respectively), the follow up process of making it Open and FAIR, and finally the long-term deposition of the data (and models and other outputs), to ensure a life after the end of the NanoCommons project. Note that there are dedicated activities developing a sustainability plan for the complete set of NanoCommons tools/services and approaches (i.e. the research infrastructure itself, including the NanoCommons Data Warehouse (data repository), which will ensure long term access under the FAIR principles and will be made available to current and future nanosafety projects and other stakeholders. The NanoCommons Data Warehouse may also be used as an application for an Advanced Community, and application for establishment of an European Research Infrastructure Consortium (ERIC), via Deliverable report D10.3 “NanoCommons Sustainability Plan”. The NanoCommons data management strategy follows the description-of-action (DoA), (Section 29.3, page 49) which prescribes access to all research data produced in the project, including that produced with Users of the TA facilities. Therefore, this deliverable will also describe suggestions for how the project partners and TA users can make data available in both Open and FAIR formats. Note that the NanoCommons DMP builds on DMP’s from related projects such as OpenRIskNet and adapts it for other types of data, such as that generated by Transnational Access (TA) Users.