The present disclosure relates to the cosmetic use of grafted polysaccharide compounds comprising at least one non-polymer siloxane graft that may be obtained by reacting a polysaccharide and a siloxane compound corresponding to formula (I), such as for the cosmetic treatment of keratin materials. The disclosure also relates to compositions comprising the grafted polysaccharide compounds in a cosmetically acceptable medium, and also to certain novel grafted polysaccharide compounds comprising at least one non-polymer siloxane graft.