Fe-doped TiO 2 nanofibers were fabricated by an electrospinning technique using poly(vinylpyrrolidine) and titanium isopropoxide as precursors. When the calcination temperature was increased, the crystallite size of the TiO 2 nanofibers increased. The Fe-doped TiO 2 nanofiber crystallites were larger than those of pure TiO 2 nanofibers because Fe promotes phase transformation. Fe controlled the phase transformation and also affected the growth of anatase crystallites. The photocatalysts were evaluated using the photodecomposition of methylene blue under UV light. Fe-doped TiO 2 nanofibers were found to be more efficient than pure TiO 2 nanofibers for photocatalytic degradation of methylene blue. The photocatalytic degradation rate fitted a pseudo-first-order equation. The rate constants of pure TiO 2 nanofibers and 0.5%-Fe-doped TiO 2 nanofibers were 0.276 and 0.570, respectively.