Inadequate health literacy decreases physical activity. This study aimed to develop and examine psychometrics of physical activity health literacy in Iranian older adults. This methodological work was conducted in two phases. Phase 1 consisted of extensive studies review and qualitative study to extract and design the items. The psychometrics were measured in Phase 2 included content, faceconstruct validities, reliability, and stability. The collected data were analyzed in SPSS (version 25.0) and AMOS (version 24.0). The results of the exploratory factor analysis showed four factors- information evaluation, reading skill, perception, and decision making-and used information that explained 70.08% of the variance. The model's fitness was supported by confirmatory factor analysis. Internal consistency based on Cronbach's alpha was .89 with composite reliability > 0.85. Stability was confirmed through the test-retest method and intraclass correlation coefficient (.89-1). Psychometrics of physical activity health literacy in Iranian older adults supported validity and reliability of the tool.
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