Lam Thanh Nguyen (Vietnamese: Lâm Thành Nguyên; 1904–1977), also known as Hai Ngoán, was a Vietnamese military leader, lieutenant general of the Vietnamese National Army and the deputy commander-in-chief of the armed forces of the Hòa Hảo. Receiving French military education, he was a native of Nhơn Nghĩa village in Cần Thơ.