See the best online casinos by gambling licenses. Choose the gambling license that is valid in your region and find the best online gambling sites that operate there legally. All the best online sportsbooks, poker sites, lotto sites, bingo sites and DFS sites have to hold a valid license in the majority of the world. For instance, if you reside in the UK, you should always play at an online casino licensed by the UK Gambling Commission. If you reside in Sweden, then you should find a legitimate online sports betting site that acquired a license from the Swedish Gambling Authority. These authorities ensure that players are protected against scammers. Click on a gambling authority below and see all the best online gambling sites that are licensed by that authority.