A series of polycarbonates with stilbene mesogens has been prepared and characterized, expanding upon past work with stilbene-based polyesters and polyethers. It has been found that the stilbene mesogen, mono- or di-substituted with methyl or ethyl groups, significantly affects polymer morphology. Polycarbonates containing stilbene mesogens have been studied by differential calorimetry, polarized microscopy and X-ray diffraction. Methyl substituted stilbenes are semicrystalline and appear to be liquid crystalline, whereas ethyl substituted stilbenes are amorphous. Disubstitution lowers the transition temperatures from those values observed for monosubstituted stilbenes.