The nonmagnetic element Ca-doped LiNbO3 films were prepared on Si (111) substrates by radio frequency (RF) magnetron sputtering technique. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) indicate that the Ca atoms enter the LiNbO₃lattice in the form of Ca₂₊ions. Superconducting quantum interference device (SQUID) results show that the Ca-doped LiNbO₃films have room-temperature ferromagnetism and a maximum saturation magnetization of 4800 A/m at the 3% of Ca atom doping concentration. The room temperature ferromagnetism of the Ca-doped LiNbO₃films can be attributed to the occurrence of vacancies due to Ca doping and is the intrinsic property.