Dan Santat is an American author and illustrator known for his children's book The Adventures of Beekle: The Unimaginary Friend, which won the 2015 Caldecott Medal for distinguished illustration. He also wrote The Guild of Geniuses and created the Disney Channel animated series The Replacements. He was awarded the 2023 National Book Award for A First Time for Everything.

The Adventures of Beekle: The Unimaginary Friend is a 2014 picture book by Dan Santat. The book won the 2015 Caldecott Award and tells the story of an imaginary friend in search of a child. This is the third book Santat has written, following The Guild of Geniuses (2004) and Sidekicks (2011), and his second picture book.