This study focuses on sustainable procurement in the public organisations in Singapore using structural equation modelling (SEM). A total of 570 questionnaires were distributed, 370 were returned and 295 were used for analysis representing 52% response rate. Results of the SEM showed that out of ten hypotheses constructed, eight hypotheses are supported. The results of the SEM showed that Waste Management (WM), Organisational Systems and Processes &amp;amp; Policies (OSPP) and Organisational Values (OVALUES) are determinants of environmentally-oriented government procurement in Singapore.   The determinant - WM consists of reverse logistics, recycling and packaging. It influences environmentally-oriented procurement practices in public organisations. Public organisations in Singapore are focussing on the benefits of reverse logistics, recycling and packaging as measures of care for the environment. The determinant - OVALUES consists of entrepreneurship, commitment, learning capability and innovation. These could shape and strengthen the culture of public organisations towards environmentally-oriented procurement practices vis-à-vis the value for money and cost efficiency, which has been the guiding principle of public procurement in the long run. This determinant is expected to have an impact on the marketplace where more innovative environmentally-oriented products could be manufactured. The determinant - OSPP which encompasses the established framework of ISO 14001, eco-labelling, product design and life cycle analysis, could further strengthen sustainable procurement practices in public organisations. The adoption of an established framework of systems, processes and policies would guide government officers in making decisions to procure sustainable products. This determinant would also facilitate their learning capability and shorten the learning curve.  This study contributes valuable insight into the determinants of environmentally-oriented procurement in public organisations in Singapore. Both managers and researchers would find it useful to know that WM, OSPP OVALUES could provide a basis in developing a managerial framework to procure environmentally-oriented products in public organisations