Isobaric liquid−liquid equilibrium (ELL) data (tie lines and miscibility gaps) for the ternary system water + acetonitrile + limonene were determined at atmospheric pressure and at temperatures ranging from (296.15 ± 0.5) K to (323.15 ± 0.5) K. The reliability of the experimental tie-line data was ascertained by using two overall concentrations for each tie line. The equilibrium data were correlated using NRTL and UNIQUAC equations. New and previously unavailable UNIQUAC and NRTL interaction parameters were obtained. Experimental data were also compared with those predicted by the UNIFAC group contribution method. At the studied temperatures, the UNIQUAC equation fit the experimental data better than NTRL, with a root-mean-square deviation value between 0.39 % and 0.99 %. The miscibility gap disappears for an acetonitrile mass fraction equal to about 81 % at 306.15 K.