In this work, the effect of multi-walled carbon nanotubes on the electrochromic properties of compact NiO thin films prepared by electrostatic spray deposition was investigated. Noticeably, a 0.5 vol% of MWCNTs between 10-30 nm in diameter enhances the electrochromic performance of NiO, such as coloration efficiency (25.8 to 31.1 cm(2)/C), coloration kinetics (0.04 to 0.14 s(-1) and cycling durability (1600-3900 cycles). The coloration efficiency and reversibility of the electrochemical reaction are related to the dispersion of MWCNTs throughout the film, while the reaction kinetics and cycling durability are attributed to an improvement in electronic and ionic conductivity.