Shia militias are armed groups primarily composed of individuals who follow the Shia branch of Islam. These militias often emerge in response to conflicts or threats to their communities, and they can operate independently or alongside national military forces. They are most commonly found in countries like Iraq, Syria, and Lebanon. Many Shia militias have been involved in regional conflicts, often fighting against Sunni extremist groups or foreign interventions. Some of the most notable militias include Hezbollah in Lebanon and the Popular Mobilization Forces in Iraq. Their activities can significantly influence local and regional politics.