Ethnic minority workers (EMWs) or migrant workers continue to be confronted with communication problems, which can have serious effects on safety outcomes. This study aims to help improve construction industry EMW safety communication by uncovering and analyzing the criticality, underlying constructs, and explanatory power of the influencing factors involved. A mixed research design is employed by combining a literature review, semistructured interviews, and questionnaire survey. Following the identification of an initial set of safety communication factors (SCFs) and a questionnaire designed and administered to EMWs in the Hong Kong and Australian construction industry, a total of 134 valid responses are analyzed through mean scoring, factor analysis and importance-explanation analysis. Eighteen critical EMW SCFs are identified and categorized into three groups of worker-related SCFs, manager-related SCFs and organization-related SCFs. A set of 36 SCFs identified can be not only used to examine the relative importance of EMW SCFs, but can also be adopted to capture the critical SCFs for both local and EM construction workers in other countries. Narrowing a wide range of SCFs for EMWs provides stakeholders with the insights needed to the key contributory factors of safety communication, which, in turn, has a positive impact on safety performance. Despite this study being conducted in Hong Kong and Australia, its findings can This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers.