The purpose of this study is to empirically identify the critical success factors of MRO e-marketplace. The research model presented in this study suggests that the success of MRO e-marketplace depends on environment of organization, type of product and service, and system of MRO e-marketplace. The major empirical findings of a survey of 38 firms in Korea are as follows: 1) The managers of firms have a deep concern on the effectiveness of MRO e-marketplace and are satisfied with the time saving provided by the transaction through MRO e-marketplace. 2) The variables affecting the success of MRO e-marketplace are classified into eight factors representing the characteristics of environment of organization, type of product and service, and system of MRO e-marketplace. 3) Among eight factors extracted from factor analysis, three factors are highly associated with the success of MRO e-marketplace. More specifically, the three factors, such as inside environment of company, capability of product supply, and basic function of MRO e-marketplace system, are the most Important factors affecting the success of MRO e-marketplace. The implications of the study are discussed and furlher research directions are proposed.