Grossmith died at his home in Folkestone at the age of 64. He is buried in Kensal Green Cemetery, in the London Borough of Brent. In his will, dated 26 October 1908, Grossmith left small bequests to a variety of charities and persons; 2,000 pounds, artworks and heirlooms to each of his children (except that Lawrence did not receive a cash bequest), his son George receiving also "two silver bowls presented to him by Sullivan and Carte the ivory baton with which he conducted the orchestra on the occasion of his said son's first appearance on the stage" in "Haste to the Wedding"; and smaller bequests to his children's spouses and his nieces, nephews, grandchildren and some cousins, with the residuary estate shared equally by his children (although the residuary estate was not large).