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The standard enthalpies of formation of some lanthanide indium compounds have been measured by high temperature direct synthesis calorimetry at 1373+/-2 K. The following results (in kJ/mole of atoms) are reported: CeIn 3 (-49.1+/-2.0); PrIn 3 (-51.3+/-2.4); NdIn 3 (-51.5+/-1.8); SmIn 3 (-52.0+/-3.1); GdIn 3 (-48.5+/-2.2); TbIn 3 (-53.5+/-2.5); DyIn 3 (-48.1+/-2.0); Ho 5 In 3 (-50.2+/-2.0); Er 5 In 3 (-47.7+/-2.5); TmIn 3 (-47.5+/-3.4); Lu 5 In 3 (-52.3+/-1.9). The results are compared with some earlier values by calorimetry and by EMF measurements. They are also compared with the predicted values of Miedema and coworkers. We also compare our measured enthalpies of formation with the predictions by Gschneidner for lanthanide alloys.