Abstract: Nozzle for filling a container with at least a first and a second viscous or paste-like material, of the type including an outer cylindrical body having a delivery mouth. The nozzle has at least two cylindrical chambers, placed inside an outer cylindrical body and fluidly separated, for the respective passage of the first and of the second viscous material, each of the at least two chambers having an outflow section of the relative viscous material substantially positioned in correspondence to a delivery mouth.