| Country | Associate Member of GREF | |
| 1 | Åland Islands | Lotteriinspektionen/Ålands Lottery inspection |
| 2 | Alderney | Alderney Gambling Control Commission |
| 3 | Austria | Federal Minstry of Finance |
| 4 | Belgium | Belgian Gaming Commission |
| 5 | Bulgaria | State Commission on Gambling |
| 6 | Bulgaria | National Revenue Agency |
| 7 | Croatia | Ministry of Finance, Tax Administration |
| 8 | Cyprus | National Gaming and Casino Supervision Commission |
| 9 | Cyprus | National Betting Authority |
| 10 | Czech Republic | Czech Republic – Ministry of Finance |
| 11 | Denmark | Spillemyndigheden (Danish Gambling Authority) |
| 12 | Estonia | Ministry of Finance |
| 13 | Finland | National Police Board of Finland/Gambling Administration |
| 14 | Finland | Ministry of Social Affairs and Health |
| 15 | France | ANJ, The National Gambling Authority of France |
| 16 | Germany | Gemeinsame Geschäftsstelle Glücksspiel |
| 17 | Gibraltar | Government of Gibraltar/Ministry of Commerce/Gambling Division |
| 18 | Greece | Hellenic Gaming Commission (HGC) |
| 19 | Hungary | Gambling Supervision Board |
| 20 | Ireland | Department of Justice and Equality |
| 21 | Ireland | Regulator of the National Lottery |
| 22 | Isle of Man | Gambling Supervision Commission |
| 23 | Jersey | Jersey Gambling Commission |
| 24 | Latvia | Lotteries and Gambling Supervision Inspection |
| 25 | Liechtenstein | Office of Economic Affairs/Gambling Regulation |
| 26 | Lithuania | Ministry of Finance – Gaming Control Authority |
| 27 | Malta | Malta Gaming Authority |
| 28 | Montenegro | Administration of Games of Chance |
| 29 | Netherlands | Kansspelautoriteit (The Netherlands Gambling Authority) |
| 30 | Northern Ireland | Social Policy Unit, Department for Communities |
| 31 | Norway | The Norwegian Gaming and Foundation Authority |
| 32 | Norway | Ministry of Culture |
| 33 | Poland | Ministry of Finance |
| 34 | Portugal | Serviço de Regulação e Inspeção de Jogos |
| 35 | Serbia | Ministry of Finance Gaming Authority |
| 36 | Slovakia | URHH (Slovak Gambling Regulatory Authority) |
| 37 | Sweden | Spelinspektionen (Swedish Gambling Authority) |
| 38 | Switzerland | Swiss Federal Gaming Board |
| 39 | Switzerland | Comlot (Swiss Lottery and Betting Board) |
| 40 | Switzerland | Swiss Federal Office of Justice/Gambling Oversight and Coordination |
| 41 | Ukraine | Commission for Regulation of Gambling and Lotteries |
| 42 | United Kingdom | Gambling Commission |