Abstract: Feeder for packaging machines comprising a conveyor for transferring a number of containers which advance with intermittent motion and on which the containers receiving the portions of product are supported in parallel rows perpendicular to the direction of advancement of the conveyor. A flexible member is arranged in a closed path around a pair of pulleys of vertical axis so as to lie in a horizontal plane above the transfer conveyor and comprising two portions parallel to the rows of containers. A plurality of compartments are distributed along the flexible member at distances equal to that of the containers of each row and arranged to receive portions of product from portion delivery means disposed at said pulleys, and to discharge said portions by gravity through lower apertures closable by doors operated by control means.