Charles de Broqueville was born into an old noble family with its roots in French Gascony. He was the son of Count Stanislas de Broqueville (1830–1919) and Claire de Briey (1832–1876). He received a private education from Catholic priest Charles Simon, from which he also learned Dutch. He married Berthe d'Huart (1864–1937), a granddaughter of Catholic statesman Jules Malou, through whom he gained further connections to politics.
Once it became clear that Germany intended to violate Belgian neutrality in August 1914, he oversaw Belgium's mobilization for war. Despite the mobilization, de Broqueville opposed King Albert I's proposal to deploy the Belgian Army along the German frontier in 1914 but strategically placed them throughout the country. He recognized that wartime support for Belgium depended upon its continued status as a nonprovocative neutral power.
During the war, de Broqueville was more willing to make concessions to the Flemish Movement than King Albert, in order to secure Belgian unity in the long term. He made several promises to the movements after the war, such as the Dutchification of Ghent University and better conditions for the Dutch language in standard education.
The opposition of the King critically weakened de Broqueville's stance among members of his cabinet. Consequently, he resigned as Foreign Secretary in January 1918 and as Prime Minister in May when he lost the support of his own party.
De Broqueville also served as minister in various departments:
Minister of Railways and PTT (Posts, Telegraphs and Telephones) 1910–1912
Later, Charles de Broqueville became Prime Minister a second time, serving from 22 October 1932 to 20 November 1934. He died on 5 September 1940, during the second German occupation of Belgium.