Abstract: A Venturi type nozzle for the texturization of yarns includes a hollow body o which compressed air is fed, a needle housed therein to which yarn is fed, and a plug, wherein the needle is provided with a longitudinal passage for the yarn, the air passes between the body and the needle, and yarn and air pass through a passage shaped like a Venturi cone in the plug, and wherein mutually facing portions of the needle head and of the plug have frusto-conical surfaces. The ratio of the axial distance between said frusto-conical surfaces to the diameter of the needle orifice is not more than 0.5, and preferably not more than 0.4. Preferably the conicity of the two frusto-conical surfaces is the same. Preferably also the outer surface of the needle head is cut off to provide a plane portion. The needle is axially displaceable and can be fixed in the desired axial position with respect to the body.