The velocities of ultrasonic shear and compressional waves in polycrystalline tungsten (99.4% dense) have been measured by a pulse‐echo technique from 24° to 1800°C. Adiabatic elastic constants have been calculated from these velocities with accuracies of ±0.25% to ±0.65%, and corrections have been applied to obtain the following equations for the elastic constants of fully dense tungsten vs temperature (°C):G=1.5893×1012−1.4733×108T−2.448×104T2 dyn−cm−2,L=5.2415×1012−3.7399×108T−4.598×104T2 dyn−cm−2,K=3.1224×1012−1.7755×108T−1.333×104T2 dyn−cm−2,E=4.0761×1012−3.5521×108T−5.871×104T2 dyn−cm−2,v=0.28247+6.1902×10−6T+3.162×10−9T2.