Najibullah, often referred to as Mullah Najibullah or Hajji Najibullah, and also known by the pseudonym Omar Khitab, is the leader of the Taliban splinter group Fidai Mahaz in Afghanistan.

The Taliban insurgency began after the group's fall from power during the 2001 War in Afghanistan. The Taliban forces fought against the Afghan government, led by President Hamid Karzai, and later by President Ashraf Ghani, and against a US-led coalition of forces that has included all members of NATO; the 2021 Taliban offensive resulted in the collapse of the government of Ashraf Ghani. The private sector in Pakistan extends financial aid to the Taliban, contributing to their financial sustenance.