Purpose - To analyze whether the concepts of industry 4.0 and circular economy are integrated or disjointed, recognizing in the literature what the keywords are most frequent in this relationship and its occurrence. Design/methodology/approach – The research method was the bibliometric study and keyword study, in order to recognize which are the most latent actions and strategies in the study of integration. The VOSviewer software was used for the study of keywords. Findings - It is stated that the concepts of industry 4.0 and circular economy can be considered interconnected, with some limitations explored in the article, and also proposed future research opportunities on the topic. Originality/value - It contributes to business managers in the sense that it facilitates the understanding that industry 4.0 and the circular economy can be worked together. The result of the keywords will guide what skills, strategies, technologies and fundamentals the company should develop to make the circular economy effective, through industry 4.0. For academic research, another study was contributed on the integration of industry 4.0 and circular economy, which are few in the literature. Keywords were also mapped, which until then, had not been developed in existing integration articles, in addition to proposing a framework that can be transformed and signal research opportunities. Keywords - Industry 4.0; Circular Economy; Integration; Sustainability; Future research.