Pièrre Vũ Ngọc Nhạ (1928-2002) is an intelligence officer of the People's Army of Vietnam. He carried out espionage activities during the Vietnam War under the cover of a high-rank officer of many South Vietnam governments. He was the core member of the A.22 espionage group during the late 1960s before his arrest by CIA in 1969. Vũ Ngọc Nhạ is the main character of the historical novel (Mr. Advisor) written by Hữu Mai, which was adapted in to a television series with the same name.