Abstract: A machine for washing, sizing and cutting the stems of mushrooms, comprises a tub full of water into which the fresh mushrooms to be treated are poured in bulk and conveyed in water into a second tub from which they are raised by suitable means to be carried on a selector device from which they fall in different positions according to their dimensions. Then they are conveyed on guides where they are arranged with their stems downwards and subsequently they are carried to the cutting device constituted by endless rotating toothed belts which provide for cutting. The first dirty end of the stem is thrown away and then a section of stem intended to be used as food is cut off so as to reduce the length of the stem to predetermined sizes. In this manner, the washed mushrooms are classified on the basis of their size and with the stem reduced to predetermined dimensions.