Denis Thatcher, English soldier and businessman, Spouse of the Prime Minister of the United Kingdom (d. 2003)
Sir Denis Thatcher, 1st Baronet, (10 May 1915 – 26 June 2003) was an English businessman and the husband of Margaret Thatcher, who served as the first female British prime minister from 1979 to 1990; in turn, he became the first male prime ministerial spouse.

Thatcher was granted the Thatcher baronetcy in 1990 and remains the most recent commoner to have been awarded a hereditary title.