The ceremony, to be held at the Royal Theatre of Mons, will mark the start of festivities linked to the 10th anniversary of the creation of the university, which resulted from the merger, in 2009, between the Université de Mons-Hainaut and the Faculté Polytechnique de Mons.
The three personalities have been selected for the award because of their contribution, each in their own way, to raising awareness on sustainable development.
Swedish student Greta Thunberg is a climate activist, British economist Nicholas Stern is an expert on the climate problem in economics, and Nicholas Hulot is a French ecologist and television journalist.
The new Honorary Doctors will now become part of a strong tradition of openness of mind, creativity and freedom of thought.
Previous laureates include Muhamad Yunus (2010), Bertrand Piccard and André Borschberg (2012), Daniel Cohen (2015), Edwy Plenel (2016), Albert Jacquard (1996), Claudie Haigneré (2008), Gisèle Halimi (1998) and Jean Ziegler (2004).