In this study, the anisotropic structure of the crust in NW Iran (including the Western Alborz, Tarom and Zanjan regions) is investigated by measuring shear wave splitting parameters. For this purpose, the converted Ps phases generated at the Moho discontinuity on the P-receiver functions constructed from teleseismic records, were used. The splitting parameters were calculated by the minimum energy method. The results show that the fast axis orientations are mostly along east-west direction which is sub-parallel to the regional geological trends and sub-normal to the regional maximum stress. The crustal anisotropy pattern might be related to the large scale geologic structures and/or the rheology of the study regions and it is less affected by the local structural perturbations.