Abu Theeb is the pseudonym of a leader of a Sunni group taking part in the Iraqi insurgency, operating north of Baghdad.
They are engaged in armed struggle against the forces of the US and the US-backed Iraqi government. His group had a dispute with Al-Qaida over tactics in relation to the referendum on the Iraqi constitution in October 2005; they supported a boycott, and his group supported a "no" vote. He also opposed Al-Qaida over indiscriminate attacks on Iraqi Shias.
During the time of the referendum a journalist from The Guardian spent five days with his group, and wrote a report.