Nemo iudex in causa sua
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Nemo iudex in sua causa (or nemo iudex in causa sua) is a Latin term that means, literally, no-one should be a judge in their own cause. It is a principle of natural justice that no person can judge a case in which he or she is a party.
May also be called:
- nemo iudex idoneus in propria causa est
- nemo iudex in parte sua
- nemo debet esse iudex in propria causa
- in propria causa nemo iudex
This along with the other principle "No man shall be judged unheard" (Audi alteram partem) otherwise put "Reasonable opportunity must be given to an accused, in defending his side of the case" forms the twin rules of natural justice.
