The article discusses the features of public relations in the activities of startups, including their communication with the external environment, as well as internal PR. Approaches to the definition of the term “startup” are analyzed, its authors’ interpretation is given, the features of key actors both within startups (the founder, the team) and in the external environment (individual and mass investors, venture, grant funds, etc.) are considered. Based on the study of the key stages of the startup life cycle, a set of necessary PR methods for establishing and maintaining the functioning of a startup, its communications with the external environment, and crowdfunding startups, including its three main types: crowdfunding, crowdlending, and crowdinvesting, are identified. Special attention is paid to the problem of conflict communications of interpersonal, group, and intergroup nature, which have a significant impact on the survival and development of startups. The authors consider the specifics of internal PR in a startup, due to the features of its communications that distinguish it from a traditional organization. The role of interpersonal factors of a highly stressful nature of activity resulting from the need to achieve results in conditions of limited time and low standardization of tasks is determined. Significant new trends are revealed that change the composition of the conflict subjects in startups and the nature of their interaction.