Insituepitaxial growth of YBa2Cu3O7−&dgr;thin films onY‐cut LiNbO3substrates using a standard laser ablation technique is reported. Resistance of the films shows a normal metallic behavior and a very sharp (<1 K) superconducting transition withTc(R=0) of 92 K. High critical current density ofJc(77 K)=2×105A/cm2is observed, which is in accordance with epitaxial growth. Film orientation observed from x‐ray diffraction spectra indicates that thecaxis is normal to the substrate plane and theaaxis is at 45° to the [11.0] direction of the hexagonal lattice of the substrate with two domains in mirror image to the (110) plane.