This entry provides a comprehensive introduction to the concept of the dinar, situating it within the broader context of Islamic economics. The dinar, derived from the Greek-Latin denarius (aureus) and adopted into Arabic as dînâr, has been a central concept in Islamic economic and financial history. The dinar functioned as a standardized weight, unit of account, legal benchmark, and moral reference within Islamic law, in addition to its primary use as a form of currency. As stated explicitly in the Qur’an, it became integral to calculating zakat, jizya, mahr, and debts. The dinar was standardized under early Islamic reforms, particularly those initiated by Abd al-Malik ibn Marwan, and served as a symbol of political sovereignty, monetary stability, and justice. Its legacy remains influential in contemporary discourse within Islamic monetary thought.