The 7in tablet PC runs Froyo, version 2.2 of Google's Android operating system and is powered by a 1GHz Samsung Hummingbird ARM-based processor.
The Galaxy Tab also includes 16GB of built-in memory, Wi-Fi and 3G connectivity and front- and back-facing cameras.
"The Samsung Galaxy Tab, striking the ideal balance of portable size and power, is leading the way in a new category of devices," said Steve Alder, O2's general manager of devices.
The tablet PC will be available online from O2 stores from November 1. The mobile network said the device would be available on all mobile broadband tariffs as well as selected voice tariffs. It said pricing details will be made available before the device hits the shelves.
See also: 20 million tablets to be sold this year