Abstract: Strategy evaluation process enables firms to continuously assess current practices and their contribution to strategy implementation. This study has examined strategy evaluation process and strategic performance of mobile telecommunication firms operating in Nigeria. The study provides new insights into the effect of strategy evaluation process on strategic performance of large firms in an emerging market such as Nigeria. The authors used theoretical insights from strategic management literature to better understand how a firm process of strategy evaluation affects strategic performance. The research has been done in a single industry, using quantitative methods and survey to obtain information from employees of four mobile telecommunication MNCs operating in Nigeria. The findings suggest that a mobile telecommunication firm adopts a systematic approach to strategy evaluation which has a significant and positive impact on their strategic performance. This study contributes to the existing literature by providing experience on the strategy evaluation process of MNCs operating in the mobile telecommunication sector in an emerging market (Nigeria). The study recommends that firms should adopt a robust strategy evaluation process that will enable them to identify and take corrective action when strategic initiatives are failing or could be improved.