International audienceThis article deals with applications of the fuzzy set theory to geographical examples. If the problematic of the uncertainty is poorly addressed in Geography, it matches important disciplinary issues such as spatio-temporal evolution, integration of linguistic or subjective qualitative data and the delineation of regions. These thematic subjects that are developed here, while showing the logic can be an effective tool to answer geographic concerns.Cet article traite d’applications de la théorie des ensembles flous à des exemples géographiques. Si la problématique de l’incertitude est relativement peu abordée en Géographie, elle correspond cependant à des enjeux disciplinaires importants, tels que l’évolution spatio-tem...