E-beam evaporated N₂-doped TiO₂ vertical nanowires are fabricated using glancing angle deposition technique. Doping is carried out during the deposition process by external supply of N₂ gas at different flow rates viz. 0, 5, 10, 20 sccm. The effect of doping concentration on various properties of the coatings is studied in detail. Refractive index value is found to be increased from 1.374 to 1.604 with increase in N₂ flow rate into the deposition chamber. Simultaneous reduction in average film transmittance (≈95–≈92%) is also observed in the visible wavelength range. Substantial reduction in optical band gap (3.85–3.43 eV) value of the coating is also noted. Surface structure of the coatings is also found to be strongly dependent on doping concentration. Samples prepared with highest doping percentage is found to have lowest RMS roughness (≈2.3 nm), void percentage (≈22%), and agglomerated grain structures. Water wetting study reveals increase in water contact angle of the samples with N₂ doping. All the samples are found to be photocatalytic in nature with improved efficiency of doped samples.