Paul Dergarabedian, of the box-office tracking firm Exhibitor Relations, said: "The four weeks it's been at number one is a testament to the perfect timing of its release."
Its North American take over the weekend beat Russell Crowe's new film, A Beautiful Mind, by $2.3 million, but Black Hawk Down, about to be released, is expected to top the box office this coming weekend.
In Australia, the Sydney Morning Herald said the film Ocean's Eleven pipped Fellowship over the weekend, although the Tolkien film has made more than $35 million there.
The record in this country is said to be $12 million for Titanic.
Feature: Lord of the Rings
Special report: A long expected party
Best Lord of the Rings websites