The torsion‐Langmuir and torsion‐effusion methods, respectively, were used to study the sublimation characteristics of oriented single‐crystal and powdered lead selenide. Analysis of the data showed that the sublimation coefficient is unity over the experimental range. From combined free‐surface and equilibrium data the expression for the sublimation pressure of PbSe from 887° to 1052°K was found to be log P(atm) =‐ (1.226±0.015) 104/T+(8.163±0.154), where T is the absolute temperature and the errors are standard deviations. Third‐law calculations of the heat of sublimation at 298°K gave 55.66±0.20 kcal/mol PbSe.