Osama bin Laden (10 March 1957 – 2 May 2011) was a militant leader who was the founder and first general emir of al-Qaeda. Ideologically a pan-Islamist, Bin Laden participated in the Afghan mujahideen against the Soviet Union, and supported the Bosnian mujahideen during the Yugoslav Wars. Opposed to American foreign policy in the Middle East, Bin Laden declared war on the United States in 1996 and advocated attacks targeting U.S. assets in various countries, and supervised the execution of the September 11 attacks inside the U.S. in 2001.

Born in Riyadh to the aristocratic bin Laden family, he studied at Saudi and foreign universities until 1979, when he joined the mujahideen fighting against the Soviet invasion of Afghanistan. In 1984, he co-founded Maktab al-Khidamat, which recruited foreign mujahideen into the war. As the Soviet war in Afghanistan came to an end, Bin Laden founded al-Qaeda in 1988 to carry out worldwide jihad. In the Gulf War, Bin Laden's offer of support to Saudi Arabia against Iraq was rejected by the Saudi royal family, which instead sought American aid.

Bin Laden's views on pan-Islamism and anti-Americanism resulted in his expulsion from Saudi Arabia in 1991. He shifted his headquarters to Sudan until 1996, when he established a new base in Afghanistan, where he was supported by the Taliban. Bin Laden declared two fatāwā in August 1996 and February 1998, declaring holy war against the U.S. After al-Qaeda's bombings of U.S. embassies in East Africa, which killed hundreds of civilians, he was indicted by a U.S. district court and listed on the FBI's Most Wanted Terrorists and Most Wanted Fugitives lists.