Lieutenant General Sir Graeme Cameron Maxwell Lamb, KBE, CMG, DSO (born 21 May 1953) is a retired British Army officer. He is a former Commander of the Field Army at Land Command, known for his contributions to counter-insurgency.

Educated at Rannoch School and the Royal Military Academy Sandhurst, Lamb was commissioned into the Queen's Own Highlanders as a second lieutenant on 8 March 1973. He has served in Northern Ireland and in various theatres of war, including Bosnia.

Lamb was promoted lieutenant on 8 September 1974, captain on 8 March 1979, and in 1981 he was Mentioned in Despatches for service in Northern Ireland. In the 1988 Birthday Honours he was appointed a Member of the Order of the British Empire. He was promoted lieutenant colonel on 30 December 1990 (with seniority from 30 June 1990), and commanded the 1st Battalion the Queen's Own Highlanders from 1991 to 1993. On 26 April 1994 he was appointed an Officer of the Order of the British Empire for his service in the Gulf War in 1991, and was awarded a Queen's Commendation for Valuable Service for operational service in Northern Ireland in 1993. He was promoted colonel on 30 June 1994, and brigadier on 30 June 1996, when he was appointed commander of the 5th Airborne Brigade. He then went on to join the staff of the Joint Services Command and Staff College. From 2001 to 2003 he served as Director Special Forces.

In the 2003 Birthday Honours, Lamb was appointed a Companion of the Order of St Michael and St George. On 2 July 2003 he was appointed General Officer Commanding 3rd (UK) Mechanised Division and promoted to major general. The formation deployed to Iraq, for the Iraq War. For his service in Iraq, he was awarded the Distinguished Service Order on 23 April 2004.

In 2005 Lamb became Director-General, Training Support and on 7 September 2006 he was deployed as Senior British Military Representative and Deputy Commanding General, Multinational Force, Iraq and promoted to lieutenant general. In relation to this role, Lamb gave evidence to The Iraq Inquiry on 9 December 2009, in which he spoke of the shortcomings of the Coalition Provisional Authority. He became Commander Field Army on 19 October 2007, and on 6 November received the honorary appointment of Colonel Commandant, Small Arms School Corps. He was advanced to Knight Commander of the Order of the British Empire in the 2009 New Year Honours. In 2009 he was appointed Officer of the Legion of Merit of the United States for his service in Iraq.

Lamb stepped down as Commander, Field Army on 6 July 2009, to be succeeded by Barney White-Spunner. In August 2009 it was reported that he would be heading for Afghanistan at the direct request of General David Petraeus of the United States Army to head a programme designed to repeat the success of Lamb's efforts in Iraq, whereby insurgents were persuaded to give up their arms. Lamb has described how US General Stanley A. McChrystal convinced him to join his team over dinner in Arlington County, Virginia. By late October 2009 he had arrived in Afghanistan. He stepped down as Colonel Commandant of the Small Arms School Corps on 13 November 2009, and officially retired from the British Army the following day, retaining a commission in the Reserve of Officers.

Lamb again joined General Stan McChrystal lecturing for the course, Gateway to Global Affairs, at Yale University in 2011.

Lamb serves as a "special adviser" to strategic advisory firm G3 and as director to private military company Aegis Defence Services. In March 2012, it emerged that Lamb's company G3 had earlier received a £1.5 million contract from the government of Bahrain for "a media campaign to support the Kingdom of Bahrain's stance before the international community." This led to allegations that Lamb may have been paid to praise Bahrain's government in public comments and written columns during the Bahraini uprising.