Purpose This paper is part of Horizon 2050 series of papers. This paper aims to highlight the importance of stronger engagement with ethical philosophy in tourism. A number of potential research streams are identified. Design/methodology/approach The paper first introduces several theories of ethics. It then reviews the history of tourism’s engagement with ethics, especially within academia. Subsequently, several themes for the future of research on tourism ethics are discussed according to four scales: the tourist, tourism business, tourism destination and the tourism system. Findings At the individual tourist level, future research should focus on better understanding tourist (un)ethical behaviour by considering the hedonic and cross-cultural nature of tourism. At business level, motivations to be ethical, ethical corporate models should be studied. Endurance of tourist products that are deemed unethical needs further analysis. At destination level, further understanding of stakeholder relations, stakeholder values and dissemination of those values is required. Fair and just options to sustainably manage visitation merit further discussion. At tourism system level, a stronger engagement with political philosophies and more creative alternatives for the current global tourism system require exploration. Originality/value While several reviews of ethics of tourism research exist, this paper is oriented towards opportunities for future research. The paper does not intend to cover all current ethical debates; however, it provides a number of topics within the tourism ethics field that merit further exploration in hope to inspire new research.