Grosgrain is a type of fabric or ribbon defined by the fact that its weft is heavier than its warp, creating prominent transverse ribs. Grosgrain is a plain weave corded fabric, with heavier cords than poplin but lighter than faille, and is known for being a firm, close-woven, fine-corded fabric. Grosgrain has a dull appearance, with little luster in comparison to many fabric weaves, such as satin, often used for ribbons; however, it is comparatively very strong. Grosgrain fabric is most commonly available in black, but grosgrain ribbon comes in a large variety of colors and patterns. The ribbon is very similar to Petersham ribbon in its appearance, but it does not have the ability to follow the curves of a surface or edge the way that the latter does.

A ribbon or riband is a thin band of material, typically cloth but also plastic or sometimes metal, used primarily as decorative binding and tying. Cloth ribbons are made of natural materials such as silk, cotton, and jute and of synthetic materials, such as polyester, nylon, and polypropylene. Ribbon is used for useful, ornamental, and symbolic purposes. Cultures around the world use ribbon in their hair, around the body, and as ornament on non-human animals, buildings, and packaging. Some popular fabrics used to make ribbons are satin, organza, sheer, silk, velvet, and grosgrain.