Overwatch Battle Group (West) was an Australian Army battlegroup that represented Australia's largest contribution to the Multinational force in Iraq.

Whilst it was never called upon to act in this role, the Battle Group did conduct combat and security operations within the cities of An Nasiriyah and As Samawah, the provincial capitals of Dhi Qar and Al Muthana respectively, extensive patrolling within rural areas and on Main Supply Routes (MSRs) to counter the indirect fire and improvised explosive device threat, training and mentoring of the Iraqi Army and Police, support to strike operations undertaken by United States Special Forces, and construction and re-construction work.

[7] As the Labor Party led by Kevin Rudd pledged in the 2007 election, Australian combat forces began withdrawing from Iraq on 1 June 2008.

[8] and the Overwatch Battle Group (West) and Australian Army Training Team formally ceased combat operations on the 2 June 2008.

Approximately 200 Australian personnel remained in Iraq on logistical and air surveillance duties after its withdrawal.