Playtech and Evolution will work with Spillebranchen and its other members to promote best practice in the industry.
Spillebranchen works to create a responsible and sustainable gaming market, encouraging cooperation between gambling businesses and authorities.
Other industry members include Bet365, Betsson, Betfair, Danske Licens Spil, Entain, Kindred Group, LeoVegas and Mr Green.
“The inclusion of gaming providers such as Playtech and Evolution not only diversifies our membership, but also strengthens our voice in efforts to promote a fair, transparent and responsible gaming environment,” Spillebranchen said.
“Their expertise and insight will be invaluable as we work together to shape the future of online gambling in Denmark and abroad.
“We look forward to the opportunities this partnership presents and look forward to a fruitful collaboration that benefits our members, the industry and the countless individuals who enjoy gambling responsibly.”
Concerns over underage gambling in Denmark
The news comes after a study last month flagged concerns over underage gambling rates in Denmark.
Published by Denmark regulator Spillemyndigheden, the study showed around 15% of young people aged between 15 and 17 have gambled.
Of those who gambled, 68% did so by placing a sports bet. Some 42% also played online casino, with an additional 21% participating in lottery and scratchcards, as well as 4% in other activities.
The report also said 35% of young people played on websites that offer skin betting. This is a feature in video games where players can win virtual items such as character outfits or new weapons.
In addition, the study found that of all calls made to the StopSpillet gambling helpline, 4% came from players under 18. This, the report says, shows people are already at risk of developing gambling-related issues at an early age.
Also last month, Spillemyndigheden issued fines to an individual for advertising illegal games across two websites. The fines totalled DKK100,000 (£11,507/€13,411/$14,530).
Games were being offered by operators without a licence in Denmark. Spillemyndigheden said the two websites linked to sites where users could gamble, even if they were registered with ROFUS, the national self-exclusion programme in Denmark.
Only sites that do not hold a licence allow users registered with ROFUS to gamble.