Flotsam is a children's wordless picture book written and illustrated by David Wiesner. Published by Clarion/Houghton Mifflin in 2006, it was the 2007 winner of the Caldecott Medal; the third win for David Wiesner. The book contains illustrations of underwater life with no text to accompany them.

David Wiesner is an American illustrator and writer of children's books, known best for picture books including some that tell stories without words. As an illustrator he has won three Caldecott Medals recognizing the year's "most distinguished American picture book for children" and he was one of five finalists in 2008 for the biennial, international Hans Christian Andersen Award, the highest recognition available for creators of children's books.