Leonard Pierre Joseph, Viscount du Bus de Gisignies (28 February 1780 – 31 May 1849) was a soldier and politician in the United Kingdom of the Netherlands.
He was born as Leonard Pierre Joseph Dubus, but on 14 June 1822, de Gisignies was added to his name.
He probably started to study law at Douai, but did not finish his education, because universities closed for some time during the French Revolution.
On 21 September 1815, in the United Kingdom of the Netherlands, he became a member of the House of Representatives of the States-General of the Netherlands for the province of West Flanders and on 20 September 1816, he was raised to Dutch nobility and was knighted on 24 November 1816, he later became its President during the meeting year from 1818 to 1819.
He had 1 daughter and 5 sons from his first marriage: He married his second wife Marie-Antoinette van der Gracht de Fretin on 20 November 1839.