Zeng Guoquan (12 October 1824 – 13 November 1890), courtesy name Yuanfu, art name Shuchun, was a Chinese official and military leader of the late Qing dynasty. He was the ninth brother of Zeng Guofan, a prominent statesman and general, and a descendant of the philosopher Zengzi. He served in the Xiang Army, a standing military force organised by his brother to counter the Taiping rebels, and was nicknamed "Ninth Marshal" (九帥). He was known for his expertise in siege warfare, particularly the use of trenches, hence he was also nicknamed "Zeng the Iron Container" (曾鐵桶). During the conquest of Tianjing (Nanjing), the capital of the Taiping Heavenly Kingdom, Zeng was notorious for condoning massacres of the city populace, which resulted in him being called "Zeng the Butcher" (曾屠戶).