Léon (Léo) Leopold Marie count d'Ursel (Bruxelles, 7 August 1867 - Bettignies, France – 26 June 1934) was a Belgian diplomat.
[1] He was the youngest son of Léon, 5th Duke of Ursel and his wife Madelein d'Harcourt.
In Paris he married Jeanne, countess de Francqueville and had 6 children.
On 31 January 1919, he was named as plenipotentiary minister and in special mission of the King of the Belgians to the Holy See.
[2] He was also secretary of the Minister of Foreign Relations during Julien Davignon's tenure.