Building on hope theory, this study demonstrates that state and trait hope are associated with daily interpersonal experiences. Multilevel modeling of daily diary data ( N = 127 adults) indicated that state hope—composed of the dual factors of pathways (i.e., the ability to devise routes toward goals) and agency (i.e., motivation to pursue devised routes)—was negatively associated with amount of daily interpersonal conflict, positively associated with constructive conflict management when conflict occurred, and negatively associated with daily challenges in maintaining relationships. These relationships were found largely at the within-person level. Further, and consistent with central tenets of hope theory, moderated multilevel models showed that within-person state pathways and agency thinking were more strongly associated with day quality on days when individuals experienced higher-than-usual levels of relational maintenance challenges. Finally, in an extension of hope theory, multilevel models showed that dispositional pathways and between-person state agency were positively linked to momentary feelings of connection as captured by experience sampling over a 7-day period. Overall, the findings contribute to the continued expansion of hope theory into the study of social and personal relationships.