Anyone with an Android device running KitKat 4.4 and above will be able to make payments if their phone has NFC.
The system will work with all existing contactless payment points, including those on the London's transport network.
Details of the payment system's UK launch were partially leaked by a coffee shop last week.
One London-based branch of Pret a Manger started displaying adverts for the contactless method alongside its card machines, saying that users Android users could pay with their phones.
Android Pay debuted in the US in September, with Australia set to be next following its UK launch.
It was immediately supported by almost all major UK banks, with the exception of Barclays, which launched its own bPay alternative.