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Resin casting is a method of plastic casting where a mould is filled with a liquid synthetic resin, which then hardens. It is primarily used for small scale production like industrial prototypes and dentistry. It can be done by amateur hobbyists with little initial investment, and has been appropriated for the production of collectible toys, models and figures, as well as small scale jewellery production.

The synthetic resin for such processes is a monomer for making a plastic thermosetting polymer. During the setting process, the liquid monomer polymerizes into the polymer, thereby hardening into a solid.