Luo Ergang (simplified Chinese: 罗尔纲; traditional Chinese: 羅爾綱; January 29, 1901 – May 25, 1997), also known as Elgan Lo and Lo Erh-kang, was a historian and researcher at the (中国社会科学院近代史研究所). He was an authority on the Taiping Rebellion from a left-wing perspective.