This document outlines the overall Dissemination and Communication Plan for the Horizon Europe project OPUS - Open and Universal Science and it encompasses all the dissemination and communication work within the project and sets out the workflows and priorities for the next phase of the project. It will help the OPUS team to organise itself efficiently. All dissemination and communication actions will be implemented with the purpose to achieve the project goals. The dissemination and communication plan defines what the consortium wishes to share with the public and the stakeholder groups the consortium will reach. It introduces the objectives, target audience, tools, dissemination and communication activities and methods and lays out the tasks which were distributed among project partners to maximise the outreach and impact. It presents how dissemination and communication activities will help OPUS reach its impacts. Dissemination activities involve the project results' knowledge sharing and are of crucial importance during the project implementation process. This plan contains sections dealing with the coordination of dissemination activities of the OPUS results/outputs towards not only scientists and researchers, but also the authorities, policy makers and anyone else whocan learn from it. Communication activities comprise a presentation of messages, activities and tools, their measurement, and coordination to promote all the project activities and inform stakeholders and multiple audiences. This document flanks the whole project implementation period, aiming to increase public awareness in connection to the work being performed within OPUS and disseminate project findings, outputs and results.