A jirga (Pashto: جرګه, jərga) is an assembly of leaders that makes decisions by consensus according to Pashtunwali, the Pashtun social code. It is conducted in order to settle disputes among the Pashtuns, but also by members of other ethnic groups who are influenced by them in present-day Afghanistan and Pakistan.

Historically, a loya jirga or a "great council" has been convened in order to elect a new head of state, approve a new constitution or resolve critical issues. Loya jirgas have reportedly been organized since the rise to power of the Hotak dynasty in the early 18th century. In July 1747, Pashtun chiefs assembled in Kandahar to elect a new king, choosing the 25-year-old Ahmad Shah Durrani, who is credited with founding the modern state of Afghanistan.

From 11 to 14 October 2024, the Pashtun National Jirga was held in Khyber to discuss the critical issues faced by the Pashtuns in Pakistan and Afghanistan.

The word jirga is cognate to Middle Mongol noun, ǰerge (originally meaning rank and order), referring to a large assembly of men forming a very broad circle, initially intended for laying siege around games or animals to be hunted for food or sport. Pashtun elders also typically sit in a circle when debating and hearing a given dispute during a tribal jirga.

In Pashto, a grand jirga is known as loya jirga (لویه جرګه, lōya jərga). A mini-jirga is called jirgagai (جرګګۍ, jərgagəy).

The institution, which is centuries old, is a similar idea to the Islamic shura ("consultative assembly").

It is thought that the ancient Indo-Iranian tribes, also known as Arya or Aryans, practiced a sort of jirga system with two types of councils – simite and sabhā. The simite (summit) comprised elders and tribal chiefs. The king also joined sessions of the simite. Sabhā was a sort of rural council. In present-day India, they are still referred to as Samiti and Sabha.

In Afghan society, the jirga is still maintained and favored, mostly by tribal leaders to solve internal or external disputes with other tribes. In some cases it functions like a town hall meeting. When the Afghans took power they tried to legitimize their hold with such a jirga. While in the beginning only Pashtuns were allowed to participate in the jirgas, later other ethnic groups like Tajiks and Hazaras were allowed to participate as well. The member of the jirgas were mostly members of the royal family, religious leaders and tribal leaders of the Afghans. King Amanullah Khan institutionalized the jirga. From Amanullah until the reign of Mohammed Zahir Shah (1933–1973) and Mohammed Daoud Khan (1973–1978) the jirga was recognized as a common meeting of regional Pashtun leaders. The meetings do not have scheduled occurrences, but rather are called for when issues or disputes arise. There is no time limit for a jirga to conclude, and the meetings often take time because decisions can only be made as a group and arguments can drag out for days. Various issues can be addressed such as major disaster, foreign policy, declaration of war, the legitimacy of leaders, and the introduction of new ideas and laws.