Iriyama Hakuo (入山白翁 (Iriyama Hakuō), or birth name 平太郎 (Heitarō); 1904 – 11 November 1991) was a lacquer artist from Shirone, Niigata in Japan. He began training as an apprentice in his family at the age of 15, and developed his own technique of painting, which he referred to as shitsuga.