International launch pushes its tablet past the milestone.
Apple says it has sold more than two million iPads since launching the device on 3 April.
The device's launch in nine countries outside the US on Friday appears to have pushed it past the milestone, although the company hasn't broken down the sales by geography.
Apple sold 300,000 in the US on 3 April, and passed the one million mark on 30 April. One month later, and the total stands at two million.
"Customers around the world are experiencing the magic of iPad, and seem to be loving it as much as we do," says CEO Steve Jobs in a statement.
"We appreciate their patience, and are working hard to build enough iPads for everyone."
Apple hasn't released an update on how many native iPad apps have been downloaded from its App Store.