There is a large discrepancy in the values reported in the literature for the azeotrope in the system propane-hydrogen sulfide. Previous investigations did not measure the azeotrope directly, but inferred it from other equilibrium measurements. In this work the azeotrope was measured directly. Correlations based on the new data were developed. In addition the binary critical locus was determined. The new values for the critical locus are in good agreement with the values reported in the literature. A comparison was made with several simple correlations for binary critical loci. The results of these comparisons showed that while good correlations exist for the critical temperature, the correlations for the critical pressure are not as good.