We used the electrospinning technique to produce lignin fibers as precursor for carbon fibers. Lignin (Indulin AT) was mixed with other plasticizing polymers to adjust the spinning properties and compatibility in electrospinning. After the optimization of the process variables, we obtained electropun fibers with diameter of ~ 4 microns. We measured the morphology of the fibers via Scanning Electron Microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS) was used to determine the chemical composition of both the surface and the bulk components. Finally, the thermal properties of lignin microfibers were evaluated by using TGA and DSC.