Abstract: Disclosed herein is a grass clipping apparatus for a rotary lawn mower, which apparatus comprises a cylindrical housing having an open lower end, means for supporting the housing with the axis of the housing extending generally vertically, a grass clipping passage or duct extending tangentially from the housing for delivering grass clippings from the lawn mower to the housing for initial centrifugal action or swirling movement of the clippings in the housing, which action or movement is effective to throw the clippings toward the outer wall of the housing, and a receptacle, preferably a disposable bag, located below the housing for receiving the clippings from the housing.