Escott Graves Meredith Reid, CC (January 21, 1905 – September 28, 1999), was a Canadian diplomat who helped shape the United Nations and NATO, author, international public servant and academic administrator.

His left-wing views and his conviction that Canada should maintain neutrality in a renewed European war put him at odds with many CIIA members, and essentially made it necessary for him to find a new career path.

In 1939, he joined the Canadian Foreign Service and held positions in Washington, London, San Francisco and Ottawa, working on the creation of the United Nations.

From 1946 to 1949 he was Lester B. Pearson's chief aide, and instrumental in devising the idea of a collective security alliance of Western democracies, which culminated in NATO.

They included works about the World Bank, the founding of the United Nations, the making of the North Atlantic Treaty, the Hungarian and Suez crises of 1956, his years in India and his friendship with Jawaharlal Nehru, and, finally, his autobiography, 'Radical Mandarin', which is how he referred to himself.

Though he was thought by some to have been 'arrogant, given to excess, and a naïve liberal idealist', Reid's vital contributions helped to shape some of the 20th century's most important international developments.