Michael O'Brien, known as Mike O'Brien, (born 19 June 1954, a son of Irish Catholic immigrants) is a Labour Party politician in the United Kingdom and currently Minister of State for Energy at the newly created Department of Energy and Climate Change.
He is the Member of Parliament for the West Midlands constituency of North Warwickshire. He has held the seat since being first elected at the 1992 general election, defeating the Conservative incumbent Francis Maude.
He served as Parliamentary Under-Secretary of State for Home Affairs from 1997 to 2001, then at the Foreign Office from 2002 to 2003. He was then appointed Minister for Trade, serving until 9 September 2004, when he became Minister of State for E-commerce, Energy & Competitiveness at the Department for Trade and Industry. In 2005 he replaced Harriet Harman as Solicitor General.
On 29 June 2007 he moved to be the Minister of State for Pension Reform in the Department for Work and Pensions under Secretary of State Peter Hain. On 5 October 2008, he was moved to be Minister of State for Energy in the newly created Department for Energy and Climate Change.