Work on high-temperature superconducting films on silicon is reviewed. High-temperature superconducting thin films of YBa₂Cu₃O_7-x (YBCO) have been made on single crystal SrTiO₃ with zero-resistance transition temperatures (T_c) of 90 K and critical current densities (J_c) up to 5*10⁶ A cm^-2 at 77 K. Both thick and thin films of YBCO have been made on silicon or on silicon with a buffer layer with T_c up to 85-90 K. Polycrystalline superconducting films with unoriented grains exhibit weak link behaviour and have low values of J_c (hundreds of A cm^-2 at 77 K), whereas the considerably higher value of 6*10⁴ A cm^-2 77 K has been achieved for YBCO deposited on a double epitaxial buffer layer on silicon.