Martha Greta Kempton (March 22, 1901 – December 9, 1991) was an Austrian-American painter who was the White House artist during the Truman administration.

Through Snyder, Kempton gained introductions to other high officials of the Truman administration.

Her works are in the collections of the White House, the U.S. Department of the Treasury, the U.S. Supreme Court, the Harry S. Truman Library, the Franklin D. Roosevelt Library, the National Portrait Gallery, and a number of museums.

Her papers, which include a number of portraits, now form a collection at the Harry S. Truman Library in Independence, Missouri.

She died in New York City from heart failure in December 1991,[2][3] and her ashes were placed in the columbarium in the Church of the Transfiguration, Manhattan.