Hudud (Arabic: حدود Ḥudūd, also transliterated hudood; plural of hadd, حد) is an Arabic word meaning "borders, boundaries, limits". In the religion of Islam, it refers to punishments that under Islamic law (sharīʿah) are mandated and fixed by God as per Islam. These punishments were applied in pre-modern Islam, and their use in some modern states has been a source of controversy.
Traditional Islamic jurisprudence divides crimes into offenses against God and those against man. The former are seen to violate God's hudud or "boundaries", and they are associated with punishments specified in the Quran and in some cases inferred from hadith. The offenses incurring hudud punishments are zina (unlawful sexual intercourse such as fornication), unfounded accusations of zina, drinking alcohol, highway robbery, and some forms of theft. Jurists have differed as to whether apostasy from Islam and rebellion against a lawful Islamic ruler are hudud crimes.
Hudud punishments range from public lashing to publicly stoning to death, amputation of hands and crucifixion. Hudud crimes cannot be pardoned by the victim or by the state, and the punishments must be carried out in public. These punishments were rarely implemented in practice, however, because the evidentiary standards were often impossibly high. For example, meeting hudud requirements for zina and theft was virtually impossible without a confession in court, which could be invalidated by a retraction. Based on a hadith, jurists stipulated that hudud punishments should be averted by the slightest doubts or ambiguities (shubuhat, sing. shubha).
During the 19th century, Sharia-based criminal laws were replaced by statutes inspired by European models in many parts of the Islamic world, although not in particularly conservative regions such as the Arabian peninsula. The Islamic revival of the late 20th century brought along calls by Islamist movements for full implementation of Sharia.