Peter Gregg Arnett, ONZM (born 13 November 1934) is a New Zealand-born journalist holding both New Zealand and US citizenship. Arnett worked for National Geographic magazine, and later for various television networks, most notably CNN. He is known for his coverage of the Vietnam War and the Gulf War. He was awarded the 1966 Pulitzer Prize in International Reporting for his work in Vietnam from 1962 to 1975, mostly reporting for the Associated Press.

In 1998, Arnett narrated a report on the joint venture (between CNN and Time magazine) program called NewsStand, covering "Operation Tailwind".  The report, titled The Valley of Death, claimed that the United States Army had used sarin against a group of deserting U.S. soldiers in Laos in 1970. The men allegedly involved were an elite Green Beret A-Team. The report was expressly approved by both CNN Chairman Tom Johnson and CNN President Rick Kaplan. In response, the Pentagon commissioned another report contradicting CNN's. CNN subsequently conducted its own investigation, which concluded that the "journalism [in the Valley of Death] was flawed" and retracted the story. While all 12 men of the Green Beret A-Team were wounded in action during Operation Tailwind, no sarin was involved.  Due to the US Government's insistence that the CNN report was flawed, three or more of the individuals responsible were fired or forced to resign. Arnett was reprimanded, and eventually left the network.  The co-producers of the report, April Oliver and Jack Smith, were dismissed. They sued Time Warner, the parent company of CNN, claiming they had been wrongfully fired, and Time Warner ultimately paid millions of dollars to settle their lawsuits, along with other suits brought by military personnel who claimed to have been libeled in the Oliver/Smith report. Senior producer Pam Hill and others resigned. Oliver was later quoted by the World Socialist Web Site (International Committee of the Fourth International) as saying that:  [Arnett's] firing was a direct result of Pentagon pressure. Perry Smith [a retired USAF major general and former CNN consultant who resigned in protest over the Tailwind report] told The Wall Street Journal last July that CNN would not get cooperation from the Pentagon unless Peter Arnett was fired. [...] They will do anything to stem the flow of information.

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