Mujahideen in the context of United Kingdom in the Soviet–Afghan War

The Afghan mujahideen were Islamist militant groups that fought against the Democratic Republic of Afghanistan and the Soviet Union during the Soviet–Afghan War and the subsequent Afghan Civil War.

The term mujahid (from Arabic مجاهد [muˈdʒaːhid]) is used in a religious context by Muslims to refer to those engaged in a struggle of any nature for the sake of Islam, commonly referred to as jihad (جهاد [dʒiˈhaːd]). The Afghan mujahideen consisted of numerous groups that differed from each other across ethnic and ideological lines, but were united by their anti-communist and Islamist goals. The coalition of anti-Soviet Muslim militias was also known as the "Afghan resistance", and the Western press widely referred to the Afghan guerrillas as "freedom fighters", or "Mountain Men".

Al-Qaeda is a pan-Islamist militant organization led by Sunni Islamist jihadists who self-identify as a vanguard spearheading a global Islamist revolution to unite the Muslim world under a supra-national Islamic caliphate. Its membership is mostly composed of Arabs but also includes people from other ethnic groups. Al-Qaeda has mounted attacks on civilian and military targets of the U.S. and its allies; such as the 1998 US embassy bombings, the USS Cole bombing, and the September 11 attacks. It has been designated a terrorist organization by the United Nations and over two dozen countries around the world.

The organization was founded in a series of meetings held in Peshawar during 1988, attended by Abdullah Azzam, Osama bin Laden, Muhammad Atef, Ayman al-Zawahiri and other veterans of the Soviet–Afghan War. Building upon the networks of Maktab al-Khidamat, the founding members decided to create an organization named "Al-Qaeda" to serve as a "vanguard" for jihad. When Saddam Hussein invaded and occupied Kuwait in 1990, bin Laden offered to support Saudi Arabia by sending his Mujahideen fighters. His offer was rebuffed by the Saudi government, which instead sought the aid of the United States. The stationing of U.S. troops in the Arabian Peninsula prompted bin Laden to declare a jihad against both the rulers of Saudi Arabia – whom he denounced as murtadd (apostates) – and against the US. From 1992, al-Qaeda established its headquarters in Sudan until it was expelled in 1996. It then shifted its base to the Taliban-ruled Afghanistan and later expanded to other parts of the world, primarily in the Middle East and South Asia. In 1996 and 1998, bin Laden issued two fatāwā that demanded the withdrawal of U.S. troops from Saudi Arabia.

The Somali National Movement (Somali: Dhaqdhaqaaqa Wadaniga Soomaaliyeed, Arabic: الحركة الوطنية الصومالية) was one of the first and most important organized guerilla groups and Mujahideen groups that opposed the Siad Barre regime in the 1980s to the 1990s, as well as being the main anti-government faction during the Somaliland War of Independence. The organisation was founded in London, England, on April 6, 1981 by Hassan Isse Jama, Hassan Adan Wadadid, and Ahmed Mohamed Gulaid and other former Somali diplomats, who stated that initially the group's purpose was to overthrow the Siad Barre regime.

In May 1991, the organisation declared an independent Republic of Somaliland in the region that had constituted British Somaliland before independence and unification with the former colony of Italian Somaliland in 1960 after the Somaliland War of Independence.

The 1992–1996 Afghan Civil War, also known as the Second Afghan Civil War, took place between 28 April 1992 — the date a new interim Afghan government was supposed to replace the Republic of Afghanistan of President Mohammad Najibullah—and the Taliban's occupation of Kabul establishing the Islamic Emirate of Afghanistan on 27 September 1996.

The war immediately followed the 1989–1992 civil war with the mujahideen victory and dissolution of the Republic of Afghanistan in April 1992. The Hezb-e Islami Gulbuddin, led by Gulbuddin Hekmatyar and supported by Pakistan's Inter-Services Intelligence (ISI), refused to form a coalition government and tried to seize Kabul with the help of Khalqists. On 25 April 1992 fighting broke out between three, and later five or six, mujahideen armies. Alliances between the combatants were transitory throughout the war.

The Afghan Civil War of 1989–1992 (Pashto: له ۱۹۸۹ څخه تر ۱۹۹۲ پوري د افغانستان کورنۍ جګړه), also known as the First Afghan Civil War, took place between the Soviet withdrawal from Afghanistan on 15 February 1989 which ended the Soviet–Afghan War, and 27 April 1992, the day after the proclamation of the Peshawar Accords proclaiming a new interim Afghan government which was supposed to start serving on 28 April 1992.

Mujahideen groups, some of them ostensibly united as part of the "Afghan Interim Government", in the years 1989–1992 proclaimed as their conviction that they were battling the hostile "puppet regime" of the Republic of Afghanistan in Kabul. In March 1989, the "Afghan Interim Government" in cooperation with the Pakistani Inter-Services Intelligence (ISI) attacked the city of Jalalabad but they were defeated by June in what is now known as the Battle of Jalalabad. Hekmatyar's Hezbi Islami would pull their support for the Afghan Interim Government following the loss in Jalalabad.

The Maktab al-Khidamat, also Maktab Khadamāt al-Mujāhidīn al-'Arab (Arabic: مكتب الخدمات or مكتب خدمات المجاهدين العرب, MAK), also known as the Afghan Services Bureau, was founded in 1984 by Abdullah Azzam, Wa'el Hamza Julaidan, Osama bin Laden and Ayman al-Zawahiri to raise funds and recruit foreign mujahideen for the war against the Soviets in Afghanistan. MAK became the forerunner to al-Qaeda and was instrumental in creating the fundraising and recruitment network that benefited Al-Qaeda during the 1990s.

The People's Mojahedin Organization of Iran (PMOI), also known as Mojahedin-e-Khalq (MEK) , Mojahedin-e-Khalq Organization (MKO)(Persian: سازمان مجاهدین خلق ایران, romanized: Sâzmân-e Mojâhedin-e Khalgh-e Irân), or simply Mojahedin, is an Iranian leftist dissident political organization. It is one of the main political actors among Iranian opposition groups opposing the Islamic Republic of Iran government as well as the Iranian monarchy.

Its headquarters is currently in Albania. The group's ideology was influenced by Islam and revolutionary Marxism; and while it denied Marxist influences, its revolutionary reinterpretation of Shia Islam was shaped by the writings of Ali Shariati. After the Iranian Revolution, the MEK opposed the new theocratic Government of the Islamic Republic of Iran, seeking to replace it with its own government. At one point the MEK was Iran's "largest and most active armed dissident group", and it is still sometimes presented by Western political backers as a major Iranian opposition group.