Resin casting is a method of plastic casting where a mold, or gaps in or between wooden constructions, is filled with a liquid synthetic resin, which then hardens. It can be done by amateur hobbyists with little initial investment, and is used in the production of tables, collectible toys, models and figures, as well as small-scale jewelry production and wood stabilization projects, for instance, in the "scales" (handles) of knives. Epoxy resins have been increasingly used in industry and in art or crafts since the 1940s.

Resin casting may be accomplished with a resin plus a nearly equal amount of a "hardener" liquid (as in many epoxy resin or polyester resin systems).