Objective: This paper presents a theory-based brief resilience scale, the Resilience Resources Scale (RRS), and evidence for its factor structure, reliability, and validity in two studies of undergraduate students. Participants: Study 1 sampled 295 students and Study 2 sampled 244 students. Methods: Study 1 participants completed the RRS and other measures online at one of two time points eight weeks apart (n = 193), or at both time points (n = 102). Study 2 participants completed the RRS and other measures online on a single occasion. Results: Factor analyses provided evidence for a one-factor model. Results indicated high internal consistency and strong test-retest reliability. Evidence of concurrent and predictive validity is presented. Conclusions: The RRS measures resilience resources known to be protective of physical and mental health. This brief scale has sound psychometric properties in these initial studies of undergraduate students. We offer possible directions for use of the RRS in this and other populations.