Abstract: A dust collecting shroud for removably attaching to a circular saw. The shroud is horizontally oriented relative to the blade of the circular saw in a position parallel to and below the base of the circular saw. The shroud has upper and lower panels enclosing and defining a dust collection chamber. The upper and lower panels have overlying slots for passing the blade and blade guard through the shroud. A short conduit stub communicating with the dust collection chamber is provided for accepting connection of a vacuum hose, which hose is not part of the invention, for evacuation of cuttings from the chamber. A removable panel has a slot of variable width, for cooperating very closely with the blade and the blade guard. This removable panel is reversibly inserted into the shroud, so that the circular saw may be reversibly mounted to the shroud. Threaded studs project upwardly from the shroud, so that they penetrate holes drilled into commercially available electrically powered circular saws.