Gwak Jae-u (; 1552–1617) was a Korean military general and patriot from Uiryeong. He was called the "Red Robe General" (천강홍의장군, 天降紅衣將軍) after his habit of wearing a coat made of red silk. In 1592, nine days into the Imjin war, he formed a Righteous army to fight against the Japanese army. He was originally a commoner, but King Seonjo of Joseon granted him a government position.