The Popular Mobilization Forces (PMF), also known as the People's Mobilization Committee (PMC) and the Popular Mobilization Units (PMU) is an Iraqi state-sponsored umbrella organization composed of approximately 67 different armed factions, with around 230,000 fighters that are mostly Shia Muslim groups, but also include Sunni Muslim, Christian, and Yazidi groups. The Popular Mobilization Units as a group was formed in 2014 and have fought in nearly every major battle against ISIL. Many of its main militias, in particular the Shias, trace their origins to the "Special Groups", Iranian-sponsored Shi'ite groups which previously fought an insurgency against the United States and the Coalition forces, as well as a sectarian conflict against Sunni Jihadist and Ba'athist insurgents. It has been called the new Iraqi Republican Guard after it was fully reorganized in early 2018 by its then–Commander in Chief Haider al-Abadi, Prime Minister of Iraq from 2014 to 2018, who issued "regulations to adapt the situation of the Popular Mobilization fighters".

The Badr Organization, previously known as the Badr Brigades or Badr Corps, is an Iraqi Shia Islamist and Khomeinist political party and paramilitary organization headed by Hadi al-Amiri. The Badr Brigade, formed in 1982 and led by Iranian officers, served as the military arm of the Supreme Council for Islamic Revolution in Iraq (SCIRI), a Shia Islamic party based in Iran. The Badr Brigade was created by Iranian intelligence and Shia cleric Mohammad Baqir al-Hakim with the aim of fighting the Ba'athist regime of Saddam Hussein during the Iran–Iraq War. Since the 2003 US-led invasion of Iraq most of the Badr Brigades' fighters have entered the new Iraqi army and police force. Politically, Badr Brigade and SCIRI were considered to be one party since 2003, but have now unofficially separated with the Badr Organization now an official Iraqi political party. Badr Brigade forces, and their Iranian commanders, have come to prominence in 2014 fighting the Islamic State of Iraq and the Levant (ISIL) in Iraq. It is a part of the Popular Mobilization Forces.