Nuclear magnetic resonance pulse techniques are appliedinsituto investigate the dynamics of mobile dislocations during creep deformation of NaCl single crystals.23Na spin‐lattice relaxation rates were measured in the rotating frame (T1&rgr;) during compression creep of single crystals of NaCl along the [110] direction at 478 K and 20 MPa. The relaxation rates are evaluated from the spin‐echo height following a &pgr;/2 locking and 64° pulse sequence. The mean jump distance of the mobile dislocations, evaluated from the ratio of the signal heights without deformation and during creep, decreased with time/strain reaching a constant value at the onset of the steady‐state creep regime. The results are compared with the dislocation‐dislocation spacing, the subgrain size, and the jump distance predicted from creep models.