This paper aims to bridge a gap in interdisciplinary research that approaches mental health issues from the perspective of medicine – in light of how it is practised in the United Kingdom - and Islamic jurisprudence (fiqh) by comparing the concept of capacity found in both fields in the hopes of setting the foundation needed to enable researchers to analyse mental health issues in-depth and to clarify the Islamic stances on them. This would be done through the presentation of the concept of capacity in psychiatric medicine and fiqh individually in terms of the relevant definitions, conditions, incidental factors etc., and then drawing comparisons between the two perspectives to understand the extent of the agreement and disagreement between them, and to clarify the correlation between them. Inductive, analytical, and comparative methodologies were adopted to peruse, analyse, and compare the opinions of scholars, doctors, and researchers. The most important findings of this research include that there is no correlation between medical capacity and the capacity for obligation, there could be a correlation between medical capacity and the capacity for performance, having medical capacity or lacking it does not necessitate the same ruling regarding one’s fiqhi capacity, and the correlation between medical capacity and fiqhi capacity depends – in general - on the severity of one’s medical condition and its impact on his intellectual capabilities.

Keywords: (Capacity, mental health, medicine, jurisprudence, Islam). 

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