Barbara, Lady Judge, American-English lawyer and businesswoman
Barbara Thomas Judge, Lady Judge, CBE (née Singer; 28 December 1946 – 31 August 2020), previously known as Barbara Singer Thomas, was an American-British lawyer and businesswoman, based in London with dual American-British citizenship.She was the first female chairman of the Institute of Directors, a previous chairman of the UK Atomic Energy Authority (UKAEA), the chairman of the United Kingdom's fraud prevention service Cifas, a chairman of the Pension Protection Fund and a British business ambassador on behalf of UK Trade & Investment. She was a trustee of several cultural and charitable institutions and a former trustee of the Royal Academy of Arts and Dementia UK.

She was often considered one of the UK's most prominent business executives, featuring in power lists compiled by Management Today, Debrett's and BBC Radio Four's Woman's Hour, the latter describing her as "one of the best-connected women in Britain."