We have fabricated epitaxial ferroelectric PbZr0.2Ti0.8O3/YBa2Cu3O7−xheterostructures on single crystalline [001] LaAlO3. Only the (00l) peaks of the PbZr0.2Ti0.8O3(PZT) film are observed, indicating that the epitaxial,c‐axis oriented YBCO film is a good structural template for the heteroepitaxial growth of PZT films, in addition to being a metallic bottom electrode. A saturation polarization and remanence as high as 38 and 26.5 &mgr;C/cm2(at 7.5 V, 0.5 kHz), respectively, have been achieved. The coercive field is about 100 kV/cm.