Purpose: The study aims to explore the demographics, perceptions, and predictors of job satisfaction of Chinese/Korean faculty and American/British faculty at Japanese universities. Design/Approach/Methods: The data from a national survey of these faculty conducted in Japan was analyzed. Findings: The study suggests that Chinese/Korean faculty tend to be distributed across all the disciplines with senior positions and have higher scientific achievements and Japanese language proficiency, contributing to their better recognition and engagement at Japanese universities. Their job satisfaction was more inclined to be influenced by the intangible factors from the environmental conditions. Whereas American/British faculty were mainly hired in Humanities and Social sciences at mid to high positions, having lower Japanese proficiency and scientific achievement, which results in their perceived lower recognition and participation at Japanese universities. However, they tend to have a higher evaluation of working conditions at Japanese universities and express higher job satisfaction. Their job satisfaction was predicted by various factors, including intangible factors and tangible factors. Originality/Value: The study was the first attempt to explore international faculty's job satisfaction in Japan. The key findings shed light on the situation of international faculty in Japan and help to better support international faculty practically.