The goal of this study was to investigate the relationship between adult attachment style, humility, and relationship satisfaction in college student couples. Attachment style--given its significant role in predicting how individuals feel, think, and behave in relationships--was expected to be an important predictor of humility, although this possibility has rarely been studied empirically. The current study found that: (a) attachment anxiety and attachment avoidance were significant, negative predictors of total humility, (b) attachment anxiety (but not attachment avoidance) was a significant, negative predictor of both intrapersonal and interpersonal humility, (c) a romantic partner's attachment avoidance (but not attachment anxiety) was a significant, negative predictor of a target person's relationship satisfaction, and (d) a romantic partner's perceived level of humility was a significant, positive predictor of a target person's relationship satisfaction.