CYC

CYC or Cyc may refer to:
 * Cycle gene, a circadian control gene found in Drosophila melanogaster responsible for the formation of the formation of CYC protein
 * Cyc, an American artificial-intelligence project
 * Champions Youth Cup, an annual international youth football (soccer) tournament
 * China Youth Corps, a Taiwanese youth organization
 * Cyclorama (theater), a curved fabric or plastic sheet backdrop for a stage
 * Cycnoches, a genus of orchid
 * Cytochrome c, a protein of the mitochondrial electron transport chain
 * Cyclophosphamide, an anti-neoplastic and immunosuppressant drug