Al-Qaeda in the Arabian Peninsula, abbreviated as AQAP, also known as Ansar al-Sharia in Yemen, is a Sunni Islamist insurgent extremist group, which is part of the al-Qaeda network and primarily active in Yemen and Saudi Arabia. It is considered the most active of al-Qaeda's branches that emerged after the weakening of central leadership.

Al-Qaeda is a pan-Islamist militant organization led by Sunni 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, economic and military targets of the US and its allies; such as the 1998 US embassy bombings, the USS Cole bombing and the September 11 attacks. The organization is designated as a terrorist group by NATO, UN Security Council, the European Union, and various countries around the world.