Halal (/həˈlɑːl/; Arabic: حلال, ḥalāl) is an Arabic word that translates to "permissible" in English. In the Quran, the word halal is contrasted with haram (forbidden). This binary opposition was elaborated into a more complex classification known as "the five decisions": mandatory, recommended, neutral, reprehensible and forbidden.[1] Islamic jurists disagree on whether the term halal covers the first two or the first four of these categories. In recent times, Islamic movements seeking to mobilize the masses and authors writing for a popular audience have emphasized the simpler distinction of halal and haram.

The term halal is particularly associated with Islamic dietary laws and especially meat processed and prepared in accordance with those requirements.

The words halal and haram are the usual terms used in the Quran to designate the categories of lawful or allowed and unlawful or forbidden. In the Quran, the root h-l-l denotes lawfulness and may also indicate exiting the ritual state of a pilgrim and entering a profane state. In both these senses, it has an opposite meaning to that conveyed by the root h-r-m (cf. haram and ihram). In a literal sense, the root h-l-l may refer to dissolution (e.g., breaking of an oath) or alighting (e.g., of God's wrath). Lawfulness is usually indicated in the Quran by means of the verb ahalla (to make lawful), with God as the stated or implied subject.[3]

Islam generally considers every food halal unless it is specifically prohibited by the Hadith or the Qur’an. Specifically, halal foods are those that are:

1. Made, produced, manufactured, processed, and stored using machinery, equipment, and/or utensils that have been cleaned according to Islamic law (Shariah).

2. Free from any component that Muslims are prohibited from eating according to Islamic law.

The most common example of haram (non-halal) food is pork. While pork is the only meat that categorically may not be consumed by Muslims (the Quran forbids it, Surah 2:173 and 16:115) other foods not in a state of purity are also considered haram. The criteria for non-pork items include their source, the cause of the animal's death and how it was processed. The majority of Islamic scholars consider shellfish and other seafood halal. Vegetarian cuisine is halal if it does not contain alcohol.

Muslims must also ensure that all foods (particularly processed foods), as well as non-food items like cosmetics and pharmaceuticals, are halal. Frequently, these products contain animal by-products or other ingredients that are not permissible for Muslims to eat or use on their bodies. Foods which are not considered halal for Muslims to consume include blood and intoxicants such as alcoholic beverages 

A Muslim who would otherwise starve to death is allowed to eat non-halal food if there is no halal food available.[8][15] During airplane flights Muslims will usually order kosher food (if halal food is not available) to ensure their chosen dish will not have any pork ingredients.

Several food companies offer halal processed foods and products, including halal foie gras, spring rolls, chicken nuggets, ravioli, lasagna, pizza and baby food. Halal ready meals are a growing consumer market for Muslims in Britain and America and are offered by an increasing number of retailers.

Opinions on GMO foods are mixed, although there is no widely accepted prohibition from consuming them. Some clerics and scholars have expressed support, arguing that such food production methods are halal because they contribute to human well-being. Voices in opposition to GMOs argue that there is no need for genetic modification of food crops because God created everything perfectly and man does not have any right to manipulate anything that God has created. Some others have raised concern about the theoretical consumption of specific GMO foods produced using genes from pigs.

Halal meat must come from a supplier that uses halal practices. Dhabīḥah (ذَبِيْحَة) is the prescribed method of slaughter for all meat sources, excluding fish and other sea-life, per Islamic law. This method of slaughtering animals consists of using a sharp knife to make an incision that cuts the front of the throat, oesophagus and jugular veins but not the spinal cord.[22] The head of an animal that is slaughtered using halal methods is aligned with the qiblah. In addition to the direction, permitted animals should be slaughtered upon utterance of the Islamic prayer Bismillah.[23]

The slaughter must be performed by a Muslim man. Animals slaughtered by non Muslims are not halal. Blood must be drained from the veins. Carrion (carcasses of dead animals, such as animals who died in the wild) cannot be eaten. Additionally, an animal that has been strangled, beaten (to death), killed by a fall, gored (to death), savaged by a beast of prey (unless finished off by a human), or sacrificed on a stone altar cannot be eaten.Stunning of the animal is not allowed before slaughtering. It is allowed only if necessary to calm down a violent animal. However, the UK Food Standards Agency figures from 2011 suggest that 84% of cattle, 81% of sheep and 88% of chickens slaughtered for halal meat were stunned before they died. Supermarkets selling halal products also report that all animals are stunned before they are slaughtered. Tesco, for example, says "the only difference between the halal meat it sells and other meat is that it was blessed as it was killed." Concerns about animal suffering from slaughter without prior stunning has resulted in the ban of slaughter of unstunned animals in Denmark, Luxembourg, Belgium, The Netherlands, Norway, Sweden and Switzerland.

Certification for halal products is given by legal authorities in most Muslim-majority countries, while in other countries, it is voluntarily acquired by companies and issued by non-governmental organizations for an annual fee.