A major host for LREE and the heat producing elements Th and U in peraluminous granites is monazite, and the stability of monazite will affect the redistribution of these elements within the crust during anatexis. The compositional stability of monazite in ''granitic'' melts ranging from peraluminous to metaluminous compositions has been investigated under water-saturated conditions between 850--1000 ¿C, at 8 Kb. Monazite solubility (concentration of LREE's in saturated melts) increases with the values of M>1.3 [=(2Ca+Na+K)/(AlXSi) in the melt>, and is constant for M<1.3. The temperature dependence of monazite saturation has been determined by Rapp and Watson [1986> for a melt of M=1.3 and model should be applicable to all peraluminous magmas. Application of the monazite solubility model to crustal anatexis indicates that for fusion temperatures at or below 800 ¿C, anatexis producing paraluminous magmas may lead to an enrichment of monazite in the restitic lower crust depending upon the initial LREE concentration in the source. At temperatures approaching 850 ¿C, enrichment of monazite in the lower crust by anatexis is unlikely due to the high monazite-saturation concentrations. ¿ American Geophysical Union 1987