<p>While various kinds of relationships other than romantic ones exist between men and women in modern society, some individuals tend to simply interpret ambiguous female-male interactions as romantic in nature, which is referred to as romantic interpretation bias (RIB). In this research, we examined the effect of self-objectification on RIB among heterosexual women. Our findings from four studies (<i>N</i> = 861), including both cross-sectional surveys (Study 1) and fully controlled experiments (Studies 2, 3A and 3B), consistently showed that women with a higher level of self-objectification exhibited a higher level of RIB when interpreting ambiguous cross-sex interactions. Additionally, this effect could be explained by an increased sense of relationship contingency (Studies 2 and 3B). Importantly, the association between self-objectification and RIB was not only demonstrated in interpreting women’s own ambiguous interactions with men (Studies 1 and 2) but also in interpreting other women’s cross-sex interactions (Studies 3A and 3B). The implications of these findings are discussed.</p>