Sir Alan David Greengross (15 April 1929 – 13 August 2018) was a British politician, who served as the final leader of the Conservative Party on the Greater London Council (GLC).
After graduation, he joined the family business, the precision engineering firm Indusmond (Diamond Tools) Ltd; he later became its chair and managing director.
He opposed this, and produced alternative plans for a smaller council, which he believed would convince the party's leadership to retain it.
He became chair of the Tory Reform Group, and worked at the Bartlett School of Architecture at University College London.
In 1990, he was appointed as chair of the Bloomsbury and Islington Health Authority, but left after two years, with the body facing a large deficit.