Two-piece nozzle for an aerosol dispenser, comprising, - an outer piece (12, 22) provided with a tubular wall (121, 221) open on one side and closed on another side by a front wall (122, 222) forming a cavity, the front wall being provided at a center thereof 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, which inner piece (11, 21) is dimensioned to penetrate into the cavity of the outer piece while being retained therein, the inner piece having a front face (111, 211) facing the front wall (122, 222) of the outer piece and a lateral face following the front face, 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), which 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), wherein the channels are divided into lateral channels (112, 224) made in the lateral face of the inner piece (11, 21) and/or in the inner face of the tubular wall 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 (112, 112', 224) decreases between the upstream end of the channels, located opposite to the front face (111, 211) or the front wall (122, 222), and the downstream end of the channels, located on the side of the front face (111, 211) or the front wall (122, 222), and in that - the inner piece has a rear face (115, 215) provided with a peripheral edge projecting in the direction opposite to the front face (111, 211), one or more passages being made in the peripheral edge to bring in contact the inner face and the outer face of said peripheral edge, which passages open into the lateral channels when said lateral channels are made in the lateral wall of the inner piece. - an outer piece (12, 22) provided with a tubular wall (121, 221) open on one side and closed on another side by a front wall (122, 222) forming a cavity, the front wall being provided at a center thereof 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, which inner piece (11, 21) is dimensioned to penetrate into the cavity of the outer piece while being retained therein, the inner piece having a front face (111, 211) facing the front wall (122, 222) of the outer piece and a lateral face following the front face, 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), which 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), wherein the channels are divided into lateral channels (112, 224) made in the lateral face of the inner piece (11, 21) and/or in the inner face of the tubular wall 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 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), which 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), wherein the channels are divided into lateral channels (112, 224) made in the lateral face of the inner piece (11, 21) and/or in the inner face of the tubular wall 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 (112, 112', 224) decreases between the upstream end of the channels, located opposite to the front face (111, 211) or the front wall (122, 222), and the downstream end of the channels, located on the side of the front face (111, 211) or the front wall (122, 222), and in that - the inner piece has a rear face (115, 215) provided with a peripheral edge projecting in the direction opposite to the front face (111, 211), one or more passages being made in the peripheral edge to bring in contact the inner face and the outer face of said peripheral edge, which passages open into the lateral channels when said lateral channels are made in the lateral wall of the inner piece.