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AIM: To examine registered nurses' individual strengths (psychological capital and grit) and an organizational resource (organizational justice) as well as associated work-related outcomes. In a time of a global nursing shortage, there is an urgent need to identify strengths and resources that can have a positive impact on the health, well-being and retention of registered nurses.

DESIGN: A cross-sectional survey.

METHODS: A nationwide convenience sample of 514 registered nurses responded to a survey. Data were collected using a self-reported questionnaire between March and May 2018. Data were analysed using descriptive statistics and multivariate path analysis.

RESULTS: Participants rated their psychological capital and grit moderately high. Grit and organizational justice were found to have significant direct effects on psychological capital. Furthermore, psychological capital had positive direct effects on engagement and the perception of well-conducted everyday nursing as well as negative direct effects on burnout, the stress of conscience and the intent to leave the profession.

CONCLUSION: The results suggest that nurse leaders and managers could consider improving registered nurses' well-being with two complementary approaches. It might be useful to reinforce positive, individual strengths, such as psychological capital, and at the same time create more favourable nursing work environments, for example by strengthening organizational justice.

IMPLICATIONS FOR THE PROFESSION: Psychological capital and grit are emerging concepts in nursing workforce research. Identifying registered nurses' positive strengths and resources is important for inventing interventions that enhance nurses' engagement and well-being as well as reduce turnover intentions.

IMPACT: Nurse leaders and managers play crucial roles in managing and developing registered nurses' individual strengths and organizational resources. This has gained even more importance now as the COVID-19 pandemic could have a long-term negative impact on nurses' well-being.

REPORTING METHOD: The study is reported following STROBE guidelines.

PATIENT OR PUBLIC CONTRIBUTION: No patient or public contribution.