Loung Ung (Khmer: អ៊ឹង លួង; born 19 November 1970) is a Cambodian-American human-rights activist, lecturer, and national spokesperson for the Campaign for a Landmine-Free World from 1997 to 2003. She has also served in the same capacity for the International Campaign to Ban Landmines, affiliated with the Vietnam Veterans of America Foundation.

Born in Phnom Penh, Cambodia, Ung was the sixth of seven children and the third of four girls to Seng Im Ung and Ay Choung Ung. At the age of 10, she escaped from Cambodia as a survivor of what became known as "the Killing Fields" during the reign of Pol Pot's Khmer Rouge regime. After emigrating to the United States and assimilating, she authored two books that relate to her life experiences from 1975 through 2003.

Today, Ung is married and resides in Shaker Heights, a suburb of Cleveland, Ohio. An author, lecturer, and activist, she has advocated for equality, human rights, and justice in her native land and worldwide for more than fifteen years.