Happiness plays a key role in influencing adolescent performance in a variety of contexts. The present study was designed to investigate the relationships between perfectionism, emotional intelligence, and happiness and to test the moderating role of emotional intelligence in the relationship between perfectionism and happiness among Malaysian adolescents. The participants were 412 Malaysian high-school students from Selangor, all of whom completed self-report questionnaires. Structural equation modeling (SEM) was used to examine whether students with high levels of personal standards perfectionism, low levels of evaluative concerns perfectionism, and high levels of emotional intelligence reported higher levels of happiness. Multigroup analyses showed that emotional intelligence emerged as a significant moderator in the link between evaluative concerns perfectionism and happiness. These findings highlight the importance of emotional intelligence in mitigating the devastating effects of evaluative concerns perfectionism on happiness.