Regulations using powers in the Gambling Act 2005, which comes into force on September 1, will ban gambling ads from companies operating outside the European Economic Area unless they can pass a strict assessment of their standards.
This follows the news that a pre-watershed ban is to be imposed on gambling ads, so that gambling brands will not be able to advertise on TV nor sponsor programmes before 9pm.
The new guidelines will also force gambling firms to remove their logos from sporting merchandise aimed at children, including replica football shirts. This will hit the likes of Tottenham Hotspur sponsor Mansion, which owns a number of online casino, poker and betting sites.
So far, only Alderney and the Isle of Man have passed the stringent assessments needed to be exempt from the ban.
Applications have been rejected from Alexander (Canadian Reservation), Netherlands Antilles and Tasmania.
James Purnell, secretary of state for culture, media and sport, said: "I make no apology for banning adverts for websites operating from places that don't meet our strict standards. Protection is my number one priority. The fact that only Alderney and the Isle of Man have been able to meet the high standards demanded by our white listing criteria shows how tough the Gambling Act is."
The ban will apply to all forms of gambling advertising including TV, radio, newspapers, magazines, taxis, buses, the Tube and some websites.