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The ternary systems LiF-NaF-LaF 3 and LiF-NaF-CeF 3 have been experimentally analyzed and thermodynamically assessed. Two models were used and compared to describe the excess Gibbs terms of the binary subsystems. One was a regular polynomial description of the excess terms, the other a quasichemical in the quadruplet approximation. In both cases, a fine agreement with the experimental data was achieved, after asymmetrical extrapolation from the binary to the ternary systems. The binary systems of the related actinide system LiF-NaF-PuF 3 were assessed, making use of experimental data known from the literature. The lanthanide systems served as a proxy for LiF-NaF-PuF 3 to calculate the ternary phase diagram.