SPP1 or SPP-1 may refer to: * SPP-1 underwater pistol, an USSR firearm made for Soviet frogmen * Secreted phosphoprotein 1, a human gene product * Suppressor of Pericarp Pigmentation 1, a maize gene implied in the phlobaphene metabolic pathway This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.