Websites that are included on the blacklist are banned from operating in the country.
Following an update at the start of the month, the IAUI has now added a number of other websites to the blacklist.
Websites that featured in the mid-November update include various Twist Casino domains as well as 24hbet.com, Igame.com, Redluck.com and Titanbet.com.
In an additional update, which took place towards the end of November, the IAUI has now banned a further 11 websites, including Playbet.com, Allbritishcasino.com and Freespincasino.com.
These websites will now join the likes of William Hill, Ladbrokes and Betfair in a long list of operators to have been banned from offering online gaming services in Latvia.
The blacklist has been updated 13 times since it was first published in August.
