Abstract: An adjustable buttonhole sewing guide includes a template preferably in the form of a thin, flexible fabric having rectangular holes therethrough for guiding a seamstress in sewing buttonholes in garments. The holes are in predetermined sizes, orientation, and spacing. Portions of the guide also have appropriately shaped corresponding guide edges which can be separated from the template and used as overlays on the template to adjust the size of the holes for sewing buttonholes of desired size. The template and overlay can be temporarily attached together to maintain the desired size of the holes in the guide and placed upon the fabric onto which the buttonholes are to be sewn.