The R-1 was a Romanian-used tank that saw action during World War II within the mechanized Romanian cavalry. It was a modified version of the AH-IV, a Czechoslovak-designed export vehicle, which was used exclusively by Romanian forces during the war. A number of 36 were used, 35 of which were built in Czechoslovakia, while one modified example was built in Romania under license. The R-1 is classified as either a light tank or tankette.