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The grease pencil, a wax writing tool also known as a wax pencil, china marker, or, in the United Kingdom, chinagraph pencil, is made of colored hardened wax and is useful for marking on hard, glossy non-porous surfaces such as porcelain, glass, polished stone, plastic, ceramics and other glazed, lacquered or polished surfaces, as well as the glossy paper which is used for photographic printing, and formerly for marking edits on analog audio tape. It is often used as a construction or handyman's marking tool as it rarely scratches the surface it is used on. It may be used to mark a wet surface. They are also used as a favorite among some traditional artists.

This pencil is available in several forms. The outer casing may be made of wood (like an ordinary pencil) and sharpened with a knife or pencil sharpener. Other types are covered in paper and sharpened by pulling a string, needing no additional tools to remain functional. More recently, it has been produced in propelling form, essentially similar to a clutch pencil but with a different lead.

This pencil is usually made from non-toxic opaque wax similar to a crayon but stronger. Marks made by grease pencils are resistant to moisture and can usually be removed by rubbing the marked surface with soft, dry paper.

Grease pencils can be found in many different colors.