Guess How Much I Love You is a British children's book written by Sam McBratney and illustrated by Anita Jeram, published in 1994, in the United Kingdom by Walker Books and in 1995, in the United States by its subsidiary Candlewick Press. The book was a 1996 ALA Notable Children's Book. According to its publishers, in addition to the ALA award and numerous other awards, it has sold more than 43 million copies worldwide and been published in 57 languages.

Based on a 2007 online poll, the National Education Association in the U.S. listed the book as one of its "Teachers' Top 100 Books for Children." Guess How Much I Love You has been published in several different formats, suitable for children from age 1½ to 8. It has been adapted as a television cartoon show in the U.S.