The Manab Nyaya Shastra (Nepali: मानव न्याय शास्त्र) is the first codified law of Nepal.
It was written by King Jayasthiti Malla in the 14th century along with the help of five learned persons; Kirtinath Upadhyaya Kanyakubja, Raghunath Jha Maithili, Srinath Bhatta, Mahinath Bhatta, and Ramanath Jha.
It was written concentrating on the practices that prevailed in the society then.
The Manab Nyaya Shastra has introduced many legal provisions regarding houses, lands, castes, dead bodies etc.
It was the major source of rendering justice during the medieval period.