Hisashi Hirai (平井久司, Hirai Hisashi, born on May 27, 1959) is a Japanese animator, character designer, and manga artist. He is noted for his work with Sunrise, having worked on Infinite Ryvius, s-CRY-ed, Gundam SEED, Gundam SEED Destiny and Fafner of the Azure. He was also the lead animator for Linebarrels of Iron.