Letterpress printing is done using cast metal type or metal plates on which the image or printing area is raised above the surface of the type or plate. The top surface of the raised areas are inked and the inked image is transferred directly to the paper.

Sites placed in this category should deal primarily with this printing process. This includes sites of trade associations, companies selling equipment and supplies, and any site providing resources about the process. In contrast, the sites of printing companies that use this process are not listed here; instead, each printing company is listed in a category based on the type of product it produces.