Apple says its profit rose by half after a bumper Christmas period, in which sales of iPhones doubled from a year ago.
Profit rose to $US3.4 billion in the three months to December, compared with a profit of $US2.3 billion in the same period a year ago.
Apple says it sold 8.7 million iPhones in the period.
Sales of Macs also rose 33% to 3.36 million units, although iPod sales fell by 8%.
On Wednesday, the company is to announce a new product, widely expected to be a touch-screen "tablet" computer.
