Abstract: A device for aerating liquids in containers is described, which may particularly be useful for the aeration of wines before consumption. The device comprises a base element to rest on the container, a tube attached to the base element and depending into the container, and means defining a variable volume above the base element and communicating with the tube. The device operates by manual expansion of the variable volume means, which preferably comprises a cylinder, the base element comprising a corresponding piston, followed by gradual reduction of the volume to force air through the tube and into the liquid.