Oldroyd Island is a small island 0.2 nautical miles (0.4 km) northwest of Magnetic Island, lying off the Vestfold Hills in the east part of Prydz Bay. Mapped by Norwegian cartographers from air photos taken by the Lars Christensen Expedition, 1936-37. Remapped by ANARE (Australian National Antarctic Research Expeditions) (1957–58) and named by Antarctic Names Committee of Australia (ANCA) for K.C.