Apparatus for feeding and folding a sheet of paper or similar materials comprising: - a feeding device for feeding sheets in a lying configuration and in sequence, - a folding device for folding the sheets coming from the feeding device which comprises a belt-type conveyor mobile in a direction of feed of said sheets to be folded, and - at least one store able to contain a plurality of said sheets stacked in a pile, said feeding device being arranged upstream of said folding device with respect to said direction of feed and comprising: - separator members intended to separate from a base of said pile an external portion of said sheet to be removed, said separator members being mobile between a distanced position, in which they do not interfere with said sheet, and a close-up position, in which they are in proximity to said external portion of said sheet in order to remove the sheet from the pile, - suction means able to create a depression in correspondence with said external portion in order to attract it into contact with said separator members so as to detach it from the base of said pile, and - pick-up members operating in a suitable phase relationship with said separator members, and the apparatus is characterized in that said pick-up members are mobile to be taken, when the separator members are in the distanced position, into a space between the flap of the external portion of the sheet and the pile, increasing the separation of the sheet from the pile made by said separator members and are configured to take said external portion of the sheet, which has been removed by the separator members from the pile, into contact with said belt-type conveyor entering said folding device. - a feeding device for feeding sheets in a lying configuration and in sequence, - a folding device for folding the sheets coming from the feeding device which comprises a belt-type conveyor mobile in a direction of feed of said sheets to be folded, and - at least one store able to contain a plurality of said sheets stacked in a pile, said feeding device being arranged upstream of said folding device with respect to said direction of feed and comprising: - separator members intended to separate from a base of said pile an external portion of said sheet to be removed, said separator members being mobile between a distanced position, in which they do not interfere with said sheet, and a close-up position, in which they are in proximity to said external portion of said sheet in order to remove the sheet from the pile, - suction means able to create a depression in correspondence with said external portion in order to attract it into contact with said separator members so as to detach it from the base of said pile, and - pick-up members operating in a suitable phase relationship with said separator members, and - separator members intended to separate from a base of said pile an external portion of said sheet to be removed, said separator members being mobile between a distanced position, in which they do not interfere with said sheet, and a close-up position, in which they are in proximity to said external portion of said sheet in order to remove the sheet from the pile, - suction means able to create a depression in correspondence with said external portion in order to attract it into contact with said separator members so as to detach it from the base of said pile, and - pick-up members operating in a suitable phase relationship with said separator members, and the apparatus is characterized in that said pick-up members are mobile to be taken, when the separator members are in the distanced position, into a space between the flap of the external portion of the sheet and the pile, increasing the separation of the sheet from the pile made by said separator members and are configured to take said external portion of the sheet, which has been removed by the separator members from the pile, into contact with said belt-type conveyor entering said folding device.