Conducting polymers were electrospun into fibers with other spinnable polymers. The optical properties of the electrospun fibers were characterized in comparison with spin-cast thin films. The electrospun conducting polymer-based fibers with different fiber diameters of 100 nm and 1 mu m were prepared. Aligned nanofibers were prepared using a rotating disc collector in order to induce molecular orientation in the electrospun fibers. The effect of electrospinning processes on the optical properties was discussed in terms of fiber diameter and molecular orientation.