- This article is about the year. For the set, see 2003 Jumbo Building Bag.
- The LEGO minifigure celebrates its 25th birthday.
- LEGO introduces new skin tones for mini-figures based on actual people. This affected the Star Wars, Harry Potter, Basketball, Ferrari and Spider-Man lines, but yellow skin tones are retained for all other figures.
- On September 13, The movie BIONICLE: Mask of Light is released.
- As of this year, 3.7 billion minifigures have been produced from LEGO.
- The WHAT WILL YOU MAKE? Bonanza happened.
Themes introduced or discontinued
- Clikits is introduced.
- LEGO Designer is introduced.
- LEGO Hockey, LEGO Basketball and LEGO Gravity Games are introduced.
- Orient Expedition, a sub-line of Adventurers, is introduced.
- Island Xtreme Stunts is discontinued.
- Inventor is introduced, then discontinued.
- World City is introduced.
- Jack Stone is replaced by 4 Juniors.