Roo is a fictional character created in 1926 by A. A. Milne and first featured in the book Winnie–the–Pooh. He is a young kangaroo (known as a joey) and his mother is Kanga. Like most other Pooh characters, Roo is based on a stuffed toy animal that belonged to Milne's son, Christopher Robin Milne, though stuffed Roo was lost a long time ago.

Roo is a fictional character in the Winnie-the-Pooh stories.