Diary of Greg Heffley's Best Friend



 is a spin-off book released in October 2018 to Scholastic Book Clubs Teacher Advisors and then in 28 February, 2018 in the UK for World Book Day.

The book focuses on Rowley's relationship with Greg Heffley from his POV. A expanded version would be released in April 2019 under the name of Diary of an Awesome Friendly Kid: Rowley Jefferson's Journal/