The concentration dependence of the mutual diffusion coefficients in the ternary liquid mixture cyclohexane (1) + toluene (2) + methanol (3) is determined at 298.15 K by the Taylor dispersion technique along three concentration paths of a constant toluene mole fraction of x(2) = 0.05, x(2) = 0. 10, and x(2) = 0.20, ranging from the binary subsystems toward the liquid-liquid phase boundary of the ternary system. The four elements of the matrix of mutual diffusion coefficients, the corresponding eigenvalues, and the determinant of the matrix are given.