PurposeThe purpose of the thesis is to discuss what extend the study about lean supply in Engineer-to-order (ETO) was carried out and the relevance/applicability of Lean Supply and elements of lean supply in ETO setting. Design/methodology/approachThe thesis is literature analysis, and, first, I introduced the lean supply and different elements of lean supply. Second I introduced the ETO setting and lean in ETO setting. Further, I did a research review of relevant articles on lean supply in ETO setting. From this, I prepared a framework on what to analyze from the literature review. Further, I analyzed the article vertically, and then what the articles discuss the element of lean supply, such as lean supplier development, Just-in-Time(JIT), and long term relationships. FindingsIt was identified that the studies on lean supply in ETO were relatively recent. Further on the relevance and applicability of lean supply and elements of lean supply, it was observed that, with customization of the practices of lean supply elements, the lean supply could be adopted in the ETO setting. However, the lean supply practices such as lean supplier development, JIT, long-term relationships are seen not adopted, as is similar to the mass-production industry in the ETO setting. Research limitations/implications / Practical implications In this research, all the 12 elements of lean supply were considered to analyze. This can limit the extent of generalization of validation of the finding. Further, the research was carried out based on literature analysis, and the literature were selected by the narrative method, and some manual inclusions and exclusion were carried out, which might limit the reproducibility of the selection of articles considered for review.