Ernest Lee Jahncke (October 13, 1877 – November 16, 1960) was United States Assistant Secretary of the Navy from 1929 to 1933. He was the first, and until the 2002 Winter Olympic bid scandal the only person ever to have been expelled from the International Olympic Committee. He was removed in July 1936 for his outspoken opposition to holding the 1936 Summer Olympics in Nazi Germany.