Sir Denis Thatcher, 1st Baronet, (10 May 1915 – 26 June 2003) was a British businessman, and the husband of the former British Prime Minister Margaret Thatcher. He was born in Lewisham, London, the elder child of a New Zealand-born British businessman, Thomas Herbert (Jack) Thatcher. He is the most recent person outside the Royal Family to be awarded a British hereditary title, which he was granted in 1990.