Viscosities and densities of di-(2-ethylhexyl) phosphoric acid (D2EHPA), kerosene, and their mixtures were determined. The viscosities were incorporated into the Kendal and Monroe equation, which can be used to determine the mixture's viscosity at specific temperatures. The viscosity measurements were made using an Ostwald U-tube viscometer, whereas the density measurements were made by using a hydrometer at temperatures ranging from (303.15 to 343.15) K in 10.00 K increments. The Riedel equation gave an excellent representation of the experimental viscosities of the mixtures as a function of temperature. The Kendal and Monroe equation, using the average molecular weight of the kerosene, gave a good estimation of the mixture viscosities.