Two-piece nozzle (1, 2) for aerosol dispenser, comprising - an outer piece (12, 22) provided with a tubular wall (121, 221) open on one side and closed on the other by a front wall (122, 222), forming a cavity, the front wall being provided in its center with an outlet opening (123, 223), the outer piece having a certain symmetry about an axis of symmetry, - an inner piece (11, 21) separate from the dispenser for which the nozzle is intended, said inner piece (11, 21) being dimensioned to penetrate into the cavity of the outer piece and be retained there, the inner piece having a front face (111, 211) facing the front wall (122, 222) of the outer piece, - channels (112, 125, 224, 225) being made in the cavity of the outer piece (12, 22) and/or on the surface of the inner piece (11, 21), wherein said channels open into a turbulence chamber (127, 227) in communication with the outlet opening (123, 223), the outlet opening (123, 223) being placed in the flow path of the product flow downstream of the turbulence chamber (127, 227), the cavity of the outer piece (12, 22) and the inner piece (11, 21) having the shape of a cylinder of revolution or of a cone of revolution about the axis of symmetry, and the channels being divided into lateral channels (112, 224) made in the cylindrical or frustoconical envelope of the inner piece (11, 21) and/or of the cavity of the outer piece (12, 22), and into converging channels (125, 225) made in the front wall (122, 222) of the outer piece or in the front face (111, 211) of the inner piece characterized in that the transverse cross-section of the lateral channels decreases between the inlet and the outlet located at the front face (111, 211) or the front wall (122, 222). - an outer piece (12, 22) provided with a tubular wall (121, 221) open on one side and closed on the other by a front wall (122, 222), forming a cavity, the front wall being provided in its center with an outlet opening (123, 223), the outer piece having a certain symmetry about an axis of symmetry, - an inner piece (11, 21) separate from the dispenser for which the nozzle is intended, said inner piece (11, 21) being dimensioned to penetrate into the cavity of the outer piece and be retained there, the inner piece having a front face (111, 211) facing the front wall (122, 222) of the outer piece, - channels (112, 125, 224, 225) being made in the cavity of the outer piece (12, 22) and/or on the surface of the inner piece (11, 21), wherein said channels open into a turbulence chamber (127, 227) in communication with the outlet opening (123, 223), the outlet opening (123, 223) being placed in the flow path of the product flow downstream of the turbulence chamber (127, 227), the cavity of the outer piece (12, 22) and the inner piece (11, 21) having the shape of a cylinder of revolution or of a cone of revolution about the axis of symmetry, and the channels being divided into lateral channels (112, 224) made in the cylindrical or frustoconical envelope of the inner piece (11, 21) and/or of the cavity of the outer piece (12, 22), and into converging channels (125, 225) made in the front wall (122, 222) of the outer piece or in the front face (111, 211) of the inner piece characterized in that the transverse cross-section of the lateral channels decreases between the inlet and the outlet located at the front face (111, 211) or the front wall (122, 222).