The Sympathizer is the 2015 debut novel by Vietnamese American professor Viet Thanh Nguyen. It is a best-selling novel, and recipient of the 2016 Pulitzer Prize for Fiction. Its reviews have generally recognized its excellence and it was named a New York Times Editor's Choice. The novel fits the expectations of a number of different novel genres: immigrant, mystery, political, metafiction, dark comedic, historical, spy, and war. The story depicts the anonymous narrator, a North Vietnamese mole in the South Vietnamese army, who stays embedded in a South Vietnamese community in exile in the United States. While in the United States, the narrator describes being an expat and a cultural advisor on the filming of an American film, closely resembling Platoon and Apocalypse Now, before returning to Vietnam as part of a guerrilla raid against the communists. The dual identity of the narrator, as a mole and immigrant, and the Americanization of the Vietnam War in international literature are central themes in the novel. The novel was published 40 years to the month after the fall of Saigon, which is the initial scene of the book.

Viet Thanh Nguyen (born March 13, 1971) is a Vietnamese-American novelist. He is the Aerol Arnold Chair of English and Professor of English and American Studies and Ethnicity at the University of Southern California. Nguyen's debut novel, The Sympathizer, won the 2016 Pulitzer Prize for Fiction among other accolades, including the Dayton Literary Peace Prize, the Center for Fiction First Novel Prize, the Carnegie Medal for Excellence in Fiction from the American Library Association, the Edgar Award for Best First Novel from an American Author from the Mystery Writers of America, and the Asian/Pacific American Award for Literature in Fiction from the Asian/Pacific American Librarians Association. He was awarded a MacArthur Foundation Fellowship in 2017.