The term ‘welfare chauvinism’ has achieved a certain currency in social science research and is used widely. Yet, the concept is not without its critics, who claim that welfare chauvinism is ‘loaded’ or ‘ambiguous’. This article reviews empirical studies of welfare chauvinism, from the 1990s to the present day, drawing primarily from party politics and attitudes research. We identify differences in how the concept is used, defined, operationalized and measured. We emphasize the importance of a unified language, operationalization and measurement, and identify promising directions for future research.