was a Japanese samurai of the Sengoku period. A high-ranking retainer of the Uesugi clan Katsunaga was one of the Kita-Echigo no Kokuninshu (北越後の国人衆; "Countrymen of Northern Echigo"), and was considered as one of the most respected men under Uesugi Kenshin. He saw action at the 4th Battle of Kawanakajima of 1561 and the Battle of Sano in the region of Kozuke in 1563 among others. For his distinction in battle at Kawanakajima he was granted Hirabayashi Castle. Katsunaga died when attempting to confront the uprising of Honjo Shigenaga in 1569. His sons included Irobe Akinaga and Irobe Nagazane.