Henry Heyward Isham (4 November 1926 – 18 June 2009), was a negotiator who played an important role in the talks with North Vietnam that led to the Peace accord of 1973. He was born in New York City in 1926 and studied International Relations at Yale, graduating in 1947 before being posted to the American Embassy in Berlin during the Cold War. From 1955 through 1957, he was chief of the consular section and political office at the United States Embassy in Moscow. From 1974 to 1977 after a posting in Hong Kong, Isham was the American ambassador to Haiti.