Major General John Mark Lancaster, Baron Lancaster of Kimbolton,[2] TD, VR, PC (born 12 May 1970) is a British Conservative Party politician, a Member of the House of Lords and a British Army reserve officer, who has served as Director Reserves since October 2023.

He previously served as Member of Parliament for North East Milton Keynes from 2005 until 2010, and then its successor seat Milton Keynes North from the seat's creation at the 2010 general election until his retirement from the House of Commons at the 2019 general election.

He was granted a life peerage in the 2019 Dissolution Honours, and was created "Baron Lancaster of Kimbolton" on 16 September 2020.

[13] He made his maiden speech on 27 October 2020, while expressing regret that as a bomb disposal expert and with his family ties to fireworks making, that it didn't occur on 5 November.

He was elected Chair of the Defence and Security Committee of the NATO Parliamentary Assembly at the 70th Annual Session held in Montreal 22–25 November 2024.

In an interview with the BBC, he stated "It may well be much harder to get the British public to back other overseas adventures by the military because of what's happened in Iraq".

In 2013 Lancaster was successful in his four-year campaign to get Khat classified as a category C drug following calls from his constituents.

[17] Between 1988 and 1990 Lancaster served in the British Army on an extended SSLC in Hong Kong with the Queen's Gurkha Engineers before going to university.

[21][22] at which point he joined the General Staff Corps (late Royal Engineers) and became Deputy Commander of 77th Brigade from 2018[23] to July 2020.

It was announced in June 2023 that he would be appointed to be Director Reserves, which position he assumed on 3 October 2023 in the rank of Major General.

[32][33] Lancaster is a supporter of MK Dons, and enjoys playing cricket, which includes the House of Commons team.