The Secret of Moonacre is a 2008 fantasy film loosely based on the 1946 novel The Little White Horse by Elizabeth Goudge. The film was directed by Gábor Csupó and starred Dakota Blue Richards in the leading role and with Ioan Gruffudd, Tim Curry, Natascha McElhone and Juliet Stevenson in supporting roles. The film premiered at the 2008 Toronto International Film Festival and was released in the United Kingdom on 6 February 2009 by Warner Bros. Pictures.

The Little White Horse is a low fantasy children's novel by Elizabeth Goudge, first published by the University of London Press in 1946 with illustrations by C. Walter Hodges, and Anne Yvonne Gilbert in 1992. Coward–McCann published a US edition next year. Set in 1842, it features a recently orphaned teenage girl who is sent to the manor house of her cousin and guardian in the West Country of England. The estate, village, and vicinity are shrouded in mystery and magic; the "little white horse" is a unicorn.