- This article is about the year. For the set, see 2003 Jumbo Building Bag.
- The LEGO minifigure celebrates its 25th birthday.
- This is the 71st anniversary of LEGO.
- LEGO introduces new skin tones (in flesh colour) 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 minifigures in other themes. For some other themes later such as The Lord of the Rings, The Hobbit, The Lone Ranger and Pirates of the Caribbean, these theme had continued using Flesh-colour face minifigures.
- On September 13, the movie BIONICLE: Mask of Light is released.
- As of this year, 3.7 billion minifigures have been produced from LEGO.
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.