Psychological capital (PsyCap) is a term coined in organizational psychology and refers to a person's development of states that motivate behavior. Also known in the literature as PsyCap, this construct typically refers to positive states of hope, self-efficacy, resilience, and optimism that are amenable to intervention and that are related to subjective well-being and life satisfaction. The aims of this systematic scoping review were to explore how PsyCap is described in youth mental health literature and how PsyCap and mental health are related. Results from four databases were reported following PRISMA guidelines. A total of 772 studies were identified and 16 studies were fully reviewed, including an overall sample of 6,772 youth from six countries. PsyCap has a positive relationship with mental health in youth. Future studies should involve school nurses to validate the constructs that characterize PsyCap and validate an instrument for measuring PsyCap in youth mental health in English.