Donald Satterlee Day (May 15, 1895 – October 1, 1966) was an American reporter in northern Europe for the ''Chicago Tribune'' in the 1920s and 1930s. As a broadcaster on German radio for several months during World War II, he argued that the United States should support Nazi Germany in its war against the Soviet Union. Following the Allied victory in Europe, he was twice arrested by U.S. authorities and investigated for treason, but no charges were brought. Due to his position in eastern Europe as a reporter for many years, Day was able to provide the U.S. government with tips about Soviet espionage agents, which played a part in his charges being dropped.
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