The standard enthalpies of formation of some 3d, 4d and 5d transition-metal stannides have been measured by high-temperature direct synthesis calorimetry at 1473+/-2 K. The following results are reported; all in kJ/mol of atoms : Ti6Sn5 : -(43.4+/-1.4); V3Sn : -(21.7+/-1.4); Zr5Sn3 : -(71.2+/-2.5); Nb3Sn : -(15.2+/-2.3); Ru3Sn7 : -(18.7+/-1.4); RhSn2 : -(42.1+/-2.4); Pd3Sn : -(57.8+/-1.9); Hf5Sn3 : -(49.2+/-2.1); Ir5Sn7 : -(15.0+/-1.9); IrSn2 : -(12.9+/-1.6); PtSn : -(58.8+/-2.3). The results are compared with some earlier values obtained by calorimetry or derived from emf or vapor-pressure measurements. They are also compared with predicted values from the semi-empirical model of Miedema et al., and with available enthalpies of formation for transition-metal germanides.