Islamic State Sinai ISIL Sinai, formerly designated under the description Ansar Bayt al-Maqdis (ABM); also known as Jamaat Ansar Bayt al-Maqdis, Ansar Beit al-Maqdis, Ansar Jerusalem, Jamaat Ansar al-Dalwa al-Islamiyya fi Bayt Al Maqdis, Aknaf Bayt al-Maqdis, Aknaf Beit al-Maqdis, Supporters of the Holy House, Mu’tassim Billah Battalion, Group of Partisans of Jerusalem, Sinai Peninsula, Wilaya of Sinai of the Islamic State, Wilayat Sinai, Wilayah Sinai, Wilayat Sayna, Islamic State-Sinai Province, Sinai Province, Province of Sinai, Islamic State in the Sinai, Daesh Sinai Province, and Islamic State of Iraq and ash-Sham in the Sinai.

Islamic State – Sinai Province (ISSP), formerly known as Ansar Bayt al-Maqdis, is a Sunni Salafist Islamist extremist group based in the Sinai Peninsula of Egypt, which first appeared in 2011. The primary objective of the group is the formation of an Islamic state in Egypt under Sharia Law. The primary targets of ISSP's violence include the Egyptian military and security services, Israeli interests, and Israeli economic interests. They have carried out repeated attacks against security forces, politicians, and civilians in Egypt using small arms, improvised explosive devices, vehicle-born improvised explosive devices, and surface-to-air missiles. In November 2014, ISSP pledged its allegiance to the Islamic State (IS), and expanded its targets to include tourist sites, Western interests, Western embassies, and the media. In August 2015, ISSP claimed to have beheaded a Croatian national kidnapped and taken hostage in Cairo in July. Two months later, ISSP claimed responsibility for downing Russian airliner KGL9268 over the Sinai through an improvised explosive device (IED) killing all 224 passengers aboard. ISSP continues to conduct cross-border attacks against Israel, including firing several rockets in February, April, and October 2017.