Abstract: A seamless guttering system formed of flat, seamless plastic is disclosed. The gutter material is thinned along longitudinal lines to be bent into a “U” shape, and includes connectors molded integrally with the flat material to lock the gutter into the proper form. The system also includes a seamless top piece that may be used to close the “U” shape into a box shape for the purpose of forming a downspout. A seamless hanger piece with connectors may be employed, or the gutters may be mounted directly to the building. Various seamless leaf guards may be employed in alternative embodiments. Flexible corner and downspout connectors complete the system.