HypothesisThe impact dynamics of droplets containing nonionic surfactants are dependent on their molecular weight and concentration. This study investigates the role of these key parameters on the droplet dynamic behavior of nonionic surfactant solutions on non-wettable alkyl ketene dimer surfaces. ExperimentsAqueous solutions of 3 nonionic surfactants, MEGA-10, Brij C10 and Brij O20, with molecular weights of ∼ 350, 683 and 1150 g/mol, were prepared at various concentrations. The droplet impact dynamics of these solutions were observed using a high-speed camera. FindingsThe results show that neither the concentration nor the molecular weight can noticeably change the spreading of the surfactant-laden droplets. A strong correlation was established between droplets’ maximum spreading factor (βmax) and Weber number (βmax = 0.76We0.29). In addition, with a slight modification, we adopted two existing analytical models to predict βmax. While the model of Pasandideh-Fard et al. overpredicts βmax, especially at We < 40, the statistical analyses showed the reasonable accuracy of the model of Ukiwe and Kwok. Furthermore, as the molecular weight decreases, the surfactants more noticeably weaken the vertical oscillation of the droplets in the retraction phase. Surfactant solutions can act similar to dampers and limit the complete/partial rebound of the droplets with no effect on their splashing behavior.