A vacuum thermostat for Mo¨ssbauer effect studies permitting temperature control from 85 to 870°K is described. Any temperature in this range can be maintained for long periods, utilizing an appropriate electronic temperature stabilizer. Temperature inhomogeneity over the sample is estimated to be less than 1°K. This thermostat can transmit radiation with a conical angle of 12°. Operation is simple and samples can be quickly interchanged.