Over the past decade, there has been a revival of social protest and labor union activity in Chile. In this article, we examine the effects of this phenomenon to analyze its influence on working-class identity. Using International Social Survey Programme surveys from 2009 and 2019, we investigate whether class location and union membership affect people’s subjective identification with the working class and how that effect may have changed over the decade. Our findings suggest that subjects who are situated in a ‘subordinated’ class position (unskilled workers or informal self-employed workers) are more likely to identify with the working class compared to subjects located in a privileged class position (employers, experts, or managers). However, surprisingly, our analysis does not indicate that working-class identity is reinforced by union membership. In addition, our results do not demonstrate that the effect of class or union membership has strengthened over the past decade. At the end of this article, we offer some possible explanations for these findings.