Viscount Joseph (Joë) Marie Clément Guillaume Berryer (Liège, 9 March 1897 – Knokke, 1 September 1978) was a Belgian diplomat.
[4][5] On 8 August 1936, at the start of the Spanish Civil War, the Belgian Ambassador Robert Everts left Madrid for Saint-Jean-de-Luz.
Berryer declared that Jacques de Borchgrave was an attaché and demanded clarifications and reparations from Francisco Largo Caballero.
He was sent to Bern in the beginning of June 1940 to start negotiations with king Leopold III of Belgium's chef de cabinet Louis Fredericq [fr].
In the long term, Berryer's report would be instrumentalised during the Royal Question (including by Jacques Pirenne) to show that the king wanted to continue the war early on.
He became part of a small number of diplomats that, under the lead of Pierre van Zuylen and Jacques Davignon, advocated the maintenance of a Department of Foreign Affairs to the occupying forces.
He was involved with the preparations of the marriage of king Baudouin of Belgium with Fabiola de Mora y Aragón and the granting of asylum to Moïse Tshombe in Spain.