David Margesson, 1st Viscount Margesson

The Right Honourable The Viscount Margesson PC
Margesson at his desk in the War Office
Secretary of State for War
In office 22 December 1940 – 22 February 1942
Prime Minister	Winston Churchill
Preceded by	Anthony Eden
Succeeded by	Sir James Grigg
Government Chief Whip in the House of Commons Parliamentary Secretary to the Treasury
In office 10 November 1931 – 22 December 1940
Prime Minister	Ramsay MacDonald Stanley Baldwin Neville Chamberlain Winston Churchill
Preceded by	Tom Kennedy
Succeeded by	Sir Charles Edwards
Personal details
Born	(1890-07-26)26 July 1890
Died	24 December 1965(1965-12-24) (aged 75)
Nationality	British
Political party	Conservative
Spouse	Frances Leggett
Alma mater	Magdalene College, Cambridge

Henry David Reginald Margesson, 1st Viscount Margesson, PC (26 July 1890 – 24 December 1965) was a British Conservative politician, most popularly remembered for his tenure as Government Chief Whip in the 1930s. His reputation was of a stern disciplinarian who was one of the harshest and most effective whips. His sense of the popular mood led him know when to sacrifice unpopular ministers. He protected the appeasement-supporting government as long as he could.

However, some argue that there were weaknesses of his system because of the number of high-profile rebellions during his tenure.