Diary of a Wimpy Kid: The Ugly Truth (Book 5)
- Publisher: Penguin
- ISBN: 9780141340821
- Ex Tax: €8.60
Diary of a Wimpy Kid: The Ugly Truth is a 2010 bestselling children's fiction book by American author and cartoonist Jeff Kinney and is the fifth book in the Diary of a Wimpy Kid series. The Ugly Truth sold 548,000 copies in its initial week of publication, edging out Decision Points, which sold 437,000 copies.