Dame Margaret Olivia Hillier, known as Meg Hillier, is a British Labour and Co-operative politician who has been the Member of Parliament (MP) for Hackney South and Shoreditch since 2005. Hillier was a junior government minister from 2007 until 2010 and was succeeded by Caroline Flint as Shadow Secretary of State for Energy and Climate Change in the Labour Party October 2011 reshuffle. She has been the chair of the Treasury Select Committee since 2024, having previously chaired the Public Accounts Committee from 2015 to 2024.