A folding unit for producing packages of pourable food products from sealed packs having at least one projecting foldable end tab. At least one conveying member cyclically receives a relative pack, by the end corresponding to the tab, and feeds the pack along a forming path crosswise in the axis of the pack. A folding mechanism having an impact surface receives each pack by the end corresponding to the tab, and is carried by the conveying member to move between a first operating position, in which the impact surface forms, with the feed direction of the relative pack, an angle of over 90° and open in the direction of the forming path, to fold the relative tab, upon impact, onto the pack in the traveling direction of the pack, and a second operating position, in which the impact surface is rotated towards and cooperates with the pack.