| Sumario: | This study aimed to develop and validate <italic>Religious Care Scale for Mothers of Children with Intellectual Disabilities (RCS-MCID)</italic>. A descriptive cross-sectional survey was conducted with 231 Iranian mothers selected via purposive sampling. Exploratory factor analysis identified 26 items loading onto four factors: <italic>Sanctity and Meaning in Care</italic>, <italic>Spiritual responsibility and reward</italic>, <italic>God’s Help</italic>, and <italic>God’s Presence and Remembrance in Care</italic>. Confirmatory factor analysis indicated acceptable model fit (CFI = .91, TLI = .90, RMSEA = .07). Convergent validity was supported by correlations with the meaning in life (r = .41, <italic>p</italic> < .01) and religious orientation (r = .46, <italic>p</italic> < .01). Divergent validity was confirmed by negative associations with depression/anxiety (r = −.23, <italic>p</italic> < .01). Internal consistency (Cronbach’s α = .96, McDonald’s ω = .91) and test-retest reliability (r = .83, <italic>p</italic> < .001) were strong. The RCS-MCID is a valid measure of religious attitudes and caregiving-related mental health.
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