Marjorie Flack was an American artist and writer of children's picture books. She was born in Greenport, Long Island, New York, in 1897. Flack is best known for her book The Story about Ping (1933), illustrated by Kurt Wiese and popularized by Captain Kangaroo. She also created stories about an insatiably curious Scottish terrier named Angus, who was actually her own dog.

Her first marriage was to artist Karl Larsson, and she later married poet William Rose Benét. Her book Angus Lost was featured prominently in the film Ask the Dust (2006), starring Colin Farrell and Salma Hayek, where Farrell's character teaches Hayek's character to read English using Flack's book.

Flack's legacy continues as her grandson, Tim Barnum, and his wife, Darlene Enix-Barnum, sponsor an annual creative writing award at Anne Arundel Community College. The Marjorie Flack Award for Fiction offers a $250 prize for the best short story or children's storybook written by a current AACC student.