This document describes the main principles of ethics to be applied within the ACTRIS activities. They shallbe acknowledged and followed by all persons affiliated to ACTRIS and should be supported by allparticipating institutions. These guidelines do not exclude other ethical issues (e.g. related to professionaland scientific responsibility, governance, social and environmental responsibility and law abiding) broughtup by the ACTRIS ERIC and its contractual ACTRIS partners, or by the Ethical Advisory Board of the ACTRISERIC.In general, everyone in ACTRIS should work in a socially ethical way keeping the integrity and fairness, andmaintaining high level of trust and respect among the people working in ACTRIS and with the users andother stakeholders. One should always take into account that the mission of ACTRIS is to provide effectiveaccess for a wide user community to its resources and services, in order to facilitate high-quality Earthsystem research, to increase the excellence in Earth system research, and to provide information andknowledge on developing sustainable solutions to societal challenges.