It is vital to gradually shift our focus to the sustainable resources of renewable energy due to the issues pertaining climatic changes. Offshore wind turbines are the most renewable resources that could accommodate world energy demand in near future. Although Malaysia is surrounded fully by sea, there are limited studies pertaining offshore wind turbines in the country�s waters. This study aims to assess the stability of a Floating Offshore Wind Turbine (FOWT) in Malaysian waters environment. The numerical simulation of the a Semi-Submersible FOWT is based on the Offshore Code Comparison, Collaboration, Continued, with Correlation (OC5) project initiated by the International Energy Agency (IEA) Wind Research Task 30. The OC5 system with the generic of a 5-MW wind turbine is connected by three mooring lines to the seabed. The responses of the OC5 FOWT based on the six degrees of freedom were obtained in terms of frequency domain, time domain as well as the response amplitude operator (RAO) under four different load cases of Malaysian waters environment. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2021.