207 The objective of this research is to verify the relationships among human resource outsourcing of four activities such as recruitment activities, training administration, payroll management, and human resource information system and organizational performance through HR cost efficiency, effective HR development and HR flexibility. The model is tested by using data collected from mail survey questionnaires of 165 multinational firms and using a questionnaire as the instrument. The results of OLS regression analysis show that HRM outsourcing has a significant impact on organizational performance both direct and indirect via HR cost efficiency, effective HR development and HR flexibility. In sum, this study contributes to manager by providing the knowledge that organizational performance can be increased by HR outsourcing implementation. Theoretical and managerial contributions, conclusion and directions of the future research are mentioned. https://jbrmr.com/details&cid=207 https://jbrmr.com/cdn/article_file/i-22_c-207.pdf Volume 10 Issue 1 22 2015-10-01 2015-11-04 no Human Resource Management Outsourcing Human Resource Management Organizational Performance none 580555 74 0 Sumittra Jirawuttinunt Mahasarakham Business School Mahasarakham University