A bathtub overflow assembly comprises a holder and a faceplate that attaches to the holder using a snap-fit or threaded connection. The holder has rectangular shape, a length greater than the diameter of a bathtub overflow port and pass-through screw holes for attachment to an overflow fitting. The holder has a pair of posts that project from an outer surface, and each post has a shoulder near a distal end for the snap-fit connection. The faceplate has walls that project from an inner surface, and the walls have openings for receiving the shoulders for the snap-fit connection. The holder is attached to the overflow fitting using one or more screws, and the faceplate is pressed into engagement with the holder for the snap-fit connection. For the threaded connection, the holder has a central threaded tube, and the faceplate has a threaded element that engages the tube by rotating the faceplate.