Preliminary results of internal friction measurements in rhenium between 100 and 350 °K are reported. For a frequency of about 300 Hz, an internal friction peak is observed in cold-rolled specimens at about 275 °K, together with a shoulder near 230 °K. Assuming that this peak is due to dislocation relaxation, an activation enthalpy of approximately 0.6 eV is estimated. Some results due to thermal treatment and/or irradiation near room temperature with 12 MeV electrons are also discussed ; it is shown that recovery occurs at 100 °C.