The film earned $31.5 million over the weekend, according to early estimates.
Kevin Costner crime drama 3 Days to Kill debuted in second place with $12.3 million.
A sequel of the Lego Movie has just been announced, with a release date set for May 2017.
The Lego Movie is the highest-grossing film of the year so far.
Gladiator drama Pompeii, starring Game of Thrones actor Kit Harington, took third place with $10 million, despite a mauling from many film critics.
The RoboCop reboot dropped from third to fourth place in its second week of release, taking $9.4 million while George Clooney’s war movie, The Monuments Men, also dropped a place, from fourth to fifth.
Two Kevin Hart movies, About Last Night and Ride Along, took sixth and seventh place respectively.
Ride Along has also secured a sequel off the back of the first film’s successful run.
North American box office chart
1. The Lego Movie – $31.5 million
2. 3 Days to Kill – $12.3 million
3. Pompeii – $10 million
4. RoboCop – $9.4 million
5. The Monuments Men – $8.1 million
Source: Rentrak
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