Yung Krall (Vietnamese: Đặng Mỹ Dung; 1946-2023) is an American former spy born in Vietnam.

Her autobiography, A Thousand Tears Falling, recounts her life growing up in the midst of the Vietnam War, as well as her life in America as a spy for the CIA, FBI, and NSA.

Yung Krall was born Đặng Mỹ Dung in 1946 near Cần Thơ in Vietnam during the French administration of the Indochine colony, and lived there during the Anti-French Resistance War.

Yung's mother chose to remain in South Vietnam to raise her children while her husband joined the Communist cause in the North with the NLF, eventually becoming Hanoi's ambassador to the U.S.S.R. Krall's father remained in the North for the greater part of her upbringing.

She played a role in the capture and conviction of North Vietnamese spies Ronald Humphrey and David Truong.