Business process knowledge management has become a popular topic thanks to an increase in digitalization projects, technology and IT system optimization and implementation initiatives, as well as an increase in knowledge generated, that requires organizations to review how process and knowledge management should be handled. This review aims to create an understanding on how knowledge management is applied within business process management. This includes identifying, analyzing, comparing and discussing the various application methods described in the literature sources, to create a thorough overview on the topic. The study was conducted as a systematic literature review, using qualitative content analysis method for the interpretation of the literature. Searches in Scopus, Web of Science, Science Direct identified 21 studies included in the review. The papers were analyzed with respect to business process knowledge management approaches. Across the reviewed literature, business process management processes are analyzed in relation to knowledge management processes looking for intersections of process components. Focus is on tacit knowledge that is one of main challenges in management aspect. The review contributes a needed common basis for future business process knowledge management research and practice by proposing the SECI model by Nonaka and Takeuchi (Socialization, Externalization, Internalization, Combination) to classify business process knowledge research, as well as suggesting a new structure of categorizing the various approaches of integrating the two concepts. Lastly, a future research agenda is proposed.