Susan Jeffers was an American children's book illustrator. A New Jersey-born 1964 graduate of Pratt Institute, her first commercial success came in 1974, when she was a honoree (runner-up) of the Caldecott Medal for illustrating Three Jovial Huntsmen, her own adaptation of a Mother Goose rhyme, which had previously been illustrated by the eponymous Randolph Caldecott. Many of Jeffers' illustrations were of animals, especially horses. Some of her publications married her original illustrations to a previously published text, used verbatim or adapted, sometimes by Jeffers herself. Otherwise, she frequently collaborated with writer and illustrator Rosemary Wells.

In 1989, Jeffers' paintings in Wells' Forest of Dreams won the Golden Kite Award's Picture Book Illustration category. Jeffers and Wells’s collaboration is famously known for their beloved McDuff children’s book series, and in 2019, the Gryphon Press brought one of their books, McDuff Moves In, back into print.

Jeffers sadly passed away at the age of 77 in 2020.