Denis Thatcher, English businessman, Spouse of the Prime Minister of the United Kingdom (died 2003)

Sir Denis Thatcher, 1st Baronet, was an English businessman and the husband of Margaret Thatcher, who served as the first female British prime minister from 1979 to 1990; thus, he became the first male prime ministerial spouse.

To date, forty-seven women and three men have been married to a British prime minister in office. There have also been four bachelor and nine widower prime ministers; the last bachelor was Edward Heath (1970–1974) and the last widower was Ramsay MacDonald. The Duke of Grafton (1768–1770) and Boris Johnson (2019–2022) are the only prime ministers to have divorced and remarried while in office.

May 10 is the 130th day of the year in the Gregorian calendar; 235 days remain until the end of the year.