The density of molten Fe2SiO4 has been bracketed at 1573, 1673, 1773, and 1873 K in the pressure range 1.1 to 1.6 GPa by observing sinking and floating ruby buoyancy markers in piston-cylinder experiments. From these data a coefficient of thermal expansion &agr;=4.8+1.7-1.5¿10-5 K-1 was calculated from the relationship: &rgr;1723K=&rgr;T-(d&rgr;/dP)ΔP>[1+&agr;ΔT> where d&rgr;/dP=0.09¿0.01 g cm-3 GPa-1 [Agee, 1992>. The high pressure thermal expansion results for molten Fe2SiO4 reported here is in excellent agreement with the coefficient of thermal expansion (&agr;=7.13¿10-5 K-1) from Shiraishi et al. [1978> done at 105 Pa by the double-bob Archimedean method using iron crucibles in a stream of argon, and the ultrasonically derived (∂&agr;/∂P)T=-1.8¿10-5 K-1 GPA-1 from Rivers and Carmichael [1987>. ¿ American Geophysical Union 1992