In order to remove nitrogen oxides by visible light photocatalytic oxidation (PCO) and promote the removal rate, (iron, nitrogen)-codoped titanium dioxide was prepared by hydrolytic precipitation and impregnation methods. As-synthesized photocatalysts were characterized by XRD, XPS, TEM and UV-vis spectra, to derive crystal structure, elemental composition and oxidation states, surface morphology, and visible light response, respectively. PCO processes of nitrogen oxides were investigated under the irradiation of LEDs (blue, green, or red). The (iron, nitrogen)-codoped titanium dioxide exhibited marked photocatalytic activity, producing higher removal rates than un-doped and nitrogen-doped TiO₂. Optimum removal effects were achieved with 0.2 at% iron doping ratio, and deactivated photocatalysts after long-term usage could be regenerated by rinsing with deionized water.