In two studies, we tested the associations between self-concept clarity and romantic-partner-focused emotional intelligence, using self-report measures of both constructs. In Study 1, in the data from two online samples (ns = 205 and 217), we found evidence of a curvilinear relationship between self-concept clarity and romantic-partner-focused emotional intelligence. This evidence showed that individuals with low and high (but not moderate) levels of self-concept clarity reported having higher levels of ability to manage, appraise, and regulate the emotions of their romantic partner. In Study 2 (n = 217), we conceptually replicated these patterns of curvilinear findings with the Sense of Self Scale (SOSS). We also found that these curvilinear effects were influenced by the participants' emotional contagion tendencies in a manner suggesting that increasing self-concept clarity tends to reduce the role of emotional contagion in predicting partner-focused emotional intelligence. Specifically, emotional contagion plays a strong role in partner-focused emotional intelligence when self-concept clarity is low, but it plays a notably weaker role when self-concept clarity is high. These findings suggest a shift toward a more nuanced understanding of a partner's emotions that is based on increasing clarity about how self and partner are different in this regard.