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Aim: To psychometrically assess the Spanish version of the Self‐Care of Chronic Illness Inventory (SC‐CII‐Sp) in community‐dwelling older adults with chronic multimorbidity. Design: A methodological study. Method: A total of 1260 older adults participated in the study between May 2020 and February 2022. The data were analysed using SPSS Statistics® 26 and AMOS® 24. The items' content validity index and the Fleiss' kappa were calculated to assess the SC‐CII‐Sp's content validity. Convergent validity was assessed by calculating the Pearson correlation coefficient between the participants' scores on the SC‐CII‐Sp and their scores on the Spanish Chronic Disease Self‐Efficacy scale (SCD‐SE). Construct validity was tested by performing a confirmatory factor analysis (CFA). The SC‐CII‐Sp's reliability was tested by computing the Cronbach's alpha. Results: The SC‐CII‐Sp showed good content and convergent validity. The CFA showed that the SC‐CII‐Sp has three sub‐scales. The 8‐item Self‐Care Maintenance sub‐scale has good internal consistency and is comprised of two dimensions: illness‐related and health‐promoting behaviour. The Self‐Care Monitoring sub‐scale had excellent internal consistency and its five loaded items belonged to a single dimension. The 6‐item Self‐Care Management sub‐scale has adequate internal consistency and two dimensions: autonomous and consulting behaviour. Conclusion: The Spanish version of SC‐CII is a valid and reliable instrument to be used in the assessment of self‐care behaviours amongst Spanish‐speaking, community‐dwelling older adults with chronic multimorbidity. Implications for the Profession: Nurses need valid and reliable tools to assess self‐care behaviours in Spanish‐speaking community‐dwelling older adults with chronic multimorbidity. This study provides a 19‐item tool that allows for the comprehensive evaluation of self‐care behaviours in healthy and ill states. Impact: Using the SC‐CII‐Sp in clinical or research settings could help nurses to examine the effects of different interventions on self‐care behaviours amongst Spanish‐speaking, community‐dwelling older adults with chronic multimorbidity. Patient or Public Contribution: None to be reported. [ABSTRACT FROM AUTHOR]