A dispenser of washing agents for washing machines, in particular dishwashers, comprises: - a dispenser body (11) with at least one receptacle (12, 12a) for containing a washing agent; - at least one door (20) having a door body (21) mounted in a guided way with respect to the dispenser body (11) for being movable between a position of closing and a position of opening of the at least one receptacle (12, 12a); and - slide guides (30a-30b, 31a-31b) between the dispenser body (11) and the door body (21). Two first walls (11b, 11c) of the dispenser body (11) each have one side facing a side of a respective second wall (21b, 21c) of the door body (21). The slide guides (30a-30b, 31a-31b) comprise guide elements (30a, 31a) and guided elements (30b, 31b) at facing sides of the first walls (11b, 11c) of the dispenser body (11) and of the second walls (21b, 21c) of the door body (21), the guided elements (30b, 31b) being slidably coupled to the guide elements (30a, 31a). For each first wall (11b, 11c) of the dispense
