Mr. Lee is the father of Collin Lee, he only appeared in the online book. Whenever Greg would bring a video game to Collin's house, Mr. Lee would take the video game and see reviews about it on a parental webisite. However Greg once put the CD in one of Manny's educational games. Mr. Lee saw it up on the website and allowed them to play it, not knowing he was fooled.
- Diary of a Wimpy Kid Online (First and only appearance)
- In the book, Robert Jefferson is the one who doesn't let Greg play violent video games.
- He is said to own every Spider-Man comic book since the late 60s, hinting he is around 50-60.