Leonard Albert Wiseman OBE BSc ARI.C CText FTI (4 November 1915 – 20 January 2009) was an organic chemist, scientific intelligence analyst and scientific administrator. Following his early work as a research chemist and in intelligence, he became, successively Deputy Director of the Atomic Weapons Research Establishment, Director of the British Rayon Research Association, succeeding John Wilson, Deputy Director of the Cotton, Silk and Man-made Fibres Research Association when the BRRA merged with the British Cotton Industry Research Association (the Shirley Institute), becoming Director in 1969 until retiring in 1980. He also served for some years as Chairman of Council of the Textile Institute.