Six Sigma has found a widespread application in a variety of organizations. However, its successful implementation depends on some critical factors. Identification and analysis of these factors is crucial in order to obtain desired results. The purpose of this study was to identify the factors critical to successful implementation of Six Sigma in a country where it is still new. Critical success factors were identified from literature and then a questionnaire was prepared. This questionnaire was sent to different industries. The data obtained through filled questionnaires from 55 respondents were analyzed. It is concluded from the results that some of the tools are being used extensively while some others are used rarely. The most critical barriers to implementation are difficulty to encourage suppliers for Six Sigma, not gaining financial outcomes from Six Sigma projects, and difficulty in making it a part of business strategy. Top management commitment, business strategy, cultural change, organizational infrastructure, and customers are more valuable for large manufacturing organizations. While small scale organizations give priority to accountability and project prioritization, tracking, and review. For the service sector training of employees and involvement of suppliers are the most important factors for successful implementation of Six Sigma.