A gynandromorph is an organism that contains both male and female characteristics. The term "gynandromorph", from Greek "gyne" female, "andro" male, and "morphé" form, is mainly used in entomology. These organisms are notable in butterflies and other insects, where both male and female body parts can be distinguished physically because of sexual dimorphism.

Gynandromorphs occasionally afford a powerful tool in genetic, developmental, and behavioral analyses. In Drosophila melanogaster, for instance, they provided evidence that male courtship behavior originates in the brain, that males can distinguish conspecific females from males by the scent of the posterior, dorsal, integument of females, that the germ cells originate in the posterior-most region of the blastoderm, and that somatic components of the gonads originate in the mesodermal region of the fourth and fifth abdominal segment.