Kay Thompson (born Catherine Louise Fink; November 9, 1909 – July 2, 1998) was an American author, singer, vocal arranger, vocal coach, composer, musician, dancer, actress, and choreographer. She became famous for creating the Eloise children's books and for her role in the movie Funny Face.

Thompson began her career in the 1930s as a singer and choral director for radio. Her first big break was as a regular singer on the Bing Crosby-Woodbury show Bing Crosby Entertains (CBS, 1933–34). This led to a regular spot on The Fred Waring-Ford Dealers Show (NBC, 1934–35) and then, with conductor Lennie Hayton, she co-founded The Lucky Strike Hit Parade (CBS, 1935), where she met (and later married) trombonist Jack Jenney. Thompson and Her Rhythm Singers joined André Kostelanetz and His Orchestra for the hit series The Chesterfield Radio Program (CBS, 1936), followed by It's Chesterfield Time (CBS, 1937), for which Thompson and her large choir were teamed with Hal Kemp and His Orchestra.