Mary Van Rensselaer Thayer (; June 16, 1902December 10, 1983) was an American socialite, journalist, and author. In 1929 she visited the Soviet Union and explored the Caucasus. She returned the following year. In 1931 she married Sigourney Thayer. Throughout that decade she wrote a column for the ''New York Journal'' and was a reporter in Eastern Europe in the aftermath of World War II. Thayer spent the 1950s to 1970s working for Magnum Photos and continuing to write news articles. She published two books on her close friend Jacqueline Kennedy.
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