Introduction: The need for client feedback in assessing healthcare services is widely recognized. However, little is known about the satisfaction of adolescent clients utilising healthcare services in Malaysia. To the best of our knowl-edge, there is no validated instrument to measure the satisfaction of adolescent clients attending health clinics in Malaysia. The objective of this study was to determine the reliability of the Malay Version of the Ministry of Health’s Adolescent Client Satisfaction Questionnaire among adolescents attending health clinics in North-eastern Malaysia. Methods: A cross-sectional study was conducted in January 2019 among adolescents aged ten to nineteen years old that attended four designated health clinics in the Kelantan state of Malaysia. The test for Cronbach’s alpha was per-formed to determine the internal consistency reliability. Results: There were a total of 85 adolescent clients involved in this study. The mean age of the respondents was 15.6 years old. Majority of respondents were female, Malay, students and attained secondary level of education. The internal consistency reliability was good as the Cronbach’s alpha of the domain was 0.854. The corrected item-total correlation for the domain was acceptable as it was 0.4 and above. Conclusion: The Malay Version of the Ministry of Health’s Adolescent Client Satisfaction Questionnaire showed excellent internal consistency reliability. Therefore, it may be recommended to be used as a tool to measure the satisfaction level among adolescents attending health clinics in Malaysia.