Ethel Cuff Black (October 17, 1890 – September 17, 1977) was an American educator and one of the founders of Delta Sigma Theta sorority.

[1][2] Her father was Richard Cuff, a banker and business owner, which allowed her to grow up in the top tier of the African-American community.

[1][9][2] She became the first African-American teacher at Public School 108 (P. S. 108) in Richmond Hills, Queens, New York, teaching there for more than 27 years.

[1][9] Black was honored by Delta Sigma Theta at its 60th National Founders Day ceremony.

[9] After her death, the Wilmington, Delaware alumnae chapter established a local Kiwanis library in her honor.

[11] In 2013, she was included in a United States Senate resolution that congratulated Delta Sigma Theta for 100 years of service.