The cetane number (CN) is one of the most important parameters regarding diesel fuel oil quality, mainly ignition properties. Traditionally, the CN determination is performed by a quite laborious and high-cost method on an explosion engine. On the other hand, nuclear magnetic resonance (NMR) spectroscopy is increasing as a versatile tool for quality control in several areas, such as petroleum and fuels, which permits the fast and direct investigation on samples. In this work, two NMRbased methods for CN determination based on multivariate calibration were developed with advantages of time saving, without the need of any sample treatment.