Ethel Cuff Black (1890 – 1977) was an American educator and one of the founders of Delta Sigma Theta sorority at Howard University. On the eve of Woodrow Wilson's first inauguration in March 1913, she and the Delta Sigma Theta sisters marched, with thousands of others, in the National Woman Suffrage Procession in Washington, D.C.

In 1930, she became the first Black teacher at P.S. #108 in Richmond Hill, Queens, and taught in Queens until her retirement in 1957.