Preform may refer to:
Preform, a piece of glass used to draw an optical fiber Preform, a piece of polyethylene terephthalate test tube shaped form blown into a completed bottle Preform, an incomplete and unused basic form of a stone tool in lithic reduction Preform, a specially designed shape of solder Preform, a high quality, precision metal stamping used for a variety of brazing and joining applications PreForm, a a software package from 3D printing technology company Formlabs
See also Perform Preformationism, a theory that organisms develop from miniature versions of themselves