Herman Phleger (1890–1984) was a San Francisco attorney and Legal Adviser of the Department of State from February 2, 1953, to April 1, 1957, under President Dwight D. Eisenhower. He succeeded Adrian S. Fisher and was succeeded by Loftus Becker. In 1959, he negotiated and signed the Antarctic Treaty on behalf of the United States. He is the namesake of the Phleger Estate.