The research objective is to explore the key success criteria to guide stakeholders in the successful implementation of Public Private Partnership (PPP) projects from the perspectives of government officials and private investors in Ghana. A survey questionnaire was administered to government officials and private investors with considerable knowledge in the concepts and experience in the implementation of PPP projects in Ghana. One hundred and thirty-nine (139) filled questionnaires were received for research analysis. Seventy-seven were government officials and sixty-two (62) were private officials. The Mann-Whitney findings revealed three of the twelve variables of key success factors of PPP projects are significantly different among the public officials and respondents from the private entities. The three variables that were significant were - Supports improved delivery of public services, expansion of infrastructure; and offers support to socio-economic development. Additionally, centered on the analytical cut-off point of 4.10, results from mean ranking analysis for both public officials and respondents from private entities for PPP projects.; four (4) variables were selected, namely: (i) Improve government comprehensive solution competence; (ii) lessens the government administrative cost; (iii) Delivery of vital publicly accepted services; and (iv) promote sustainable public service delivery and infrastructure development. The results of this paper contribute to the worldwide acceptable practice framework for promoting the implementation of PPP projects in developing countries. Both government officials and private investors will be informed as to the expectation and success factors and stakeholders’ expectation in their PPP engagement in the context of developing countries.