| TAB tab.com.au | Tabcorp Holdings Limited | Australia Liquor & Gaming NSW | 1 |
| TAB (4Racing) tab.co.za | 4Racing | South Africa Gauteng, South Africa Mpumalanga | 1 |
| TAB NZ tab.co.nz | TAB New Zealand | New Zealand | 1 |
| TabTouch tabtouch.mobi | Racing and Wagering Western Australia (RWWA) | Australia WA DLGSC | 1 |
| Take A Break Bingo takeabreakbingo.co.uk | run by Jumpman Gaming white label | UKGC, Alderney | 1 |
| Takeaway Slots takeawayslots.com | run by Jumpman Gaming white label | UKGC, Alderney | 1 |
| talkSPORT BET talksportbet.com | BetVictor | UKGC, Ireland | 1 |
| Tamambet tamambet.com | Ryker | Curaçao | 1 |
| Tangobet tangobet.co.uk | run by ProgressPlay white label | UKGC, MGA | 1 |
| TaoFortune taofortune.com | A1 Development LLC | — | 1 |
| Target Slots targetslots.com | Jumpman Gaming | UKGC, Alderney | 1 |
| TasBet tasbet.rs | TasBet | Serbia | 1 |
| Tasty Bingo tastybingo.com | Broadway Gaming Group | UKGC | 1 |
| Te Apuesto teapuesto.pe | Nexus Group (Intercorp) - La Tinka | Peru MINCETUR | 1 |
| Teambet teambet.com.au | Betfocus (incl. TeamBet) | Australia Liquor & Gaming NSW | 1 |
| Ted Bingo tedbingo.com | Broadway Gaming Group | UKGC | 1 |
| Temple Nile templenile.com | run by White Hat Gaming white label | UKGC, MGA | 1 |
| TG.Casino tg.casino | TG.Casino | — | 1 |
| The Clubhouse Casino theclubhousecasino.com | Dama N.V. / Novatrix SRL network | Tobique, Anjouan | 1 |
| The Football Pools footballpools.com | Hoplon Investment Partners LLP | UKGC | 1 |
| The Lott thelott.com | The Lottery Corporation Limited | — | 1 |
| The Masked Singer Games closed maskedsingergames.co.uk | SkillOnNet | UKGC, MGA, Sweden | 1 |
| The Money Factory closed themoneyfactory.com | Not identified | — | 1 |
| The Phone Casino thephonecasino.com | run by Jumpman Gaming white label | UKGC, Alderney | 1 |
| The Slots Island theslotsisland.com | run by Broadway Gaming Group white label | UKGC | 1 |
| The Sun Play thesunplay.co.uk | run by Jumpman Gaming white label | UKGC, Alderney | 1 |
| The Vic thevic.com | The Rank Group Plc | UKGC | 1 |
| The X Factor Games thexfactorgames.com | run by Jumpman Gaming white label | UKGC, Alderney | 1 |
| TheLines thelines.com | Catena Media plc | — | 1 |
| theScore Bet thescore.bet | PENN Entertainment, Inc. | Canada, US state | 3 |
| Thor Casino thorcasino.com | Wild Blackfin Limited SRL | Anjouan | 1 |
| Thor Slots thorslots.com | run by Jumpman Gaming white label | UKGC, Alderney | 1 |
| Thrills thrills.com | Betsson AB | MGA | 1 |
| Thrillsy thrillsy.com | Next Global Era Limited | Anjouan | 1 |
| Thrillzz thrillzz.com | Thrillzz Inc. | — | 1 |
| Thunderpick thunderpick.io | Paloma Media | Curaçao | 1 |
| Tiger.bet closed tiger.bet.br | Betspeed Ltda | Brazil SPA (Ministry of Finance) | 1 |
| Tigerspin DE tigerspin.de | Rabbit Entertainment | Germany | 1 |
| Tigon Bet tigonbet.co.ke | Not identified | Kenya | 1 |
| TikiTaka Play tikitakaplay.es | Grupo Tiki Taka Games | Spain | 1 |
| Tinbet tinbet.pe | Not identified | Peru MINCETUR | 1 |
| Tío Rico tiorico.bet | Not identified | Peru MINCETUR | 1 |
| Tip Top Bingo tiptopbingo.com | Broadway Gaming Group | UKGC | 1 |
| Tipico tipico.de | Tipico Group | Germany | 5 |
| Tipobet tipobet.com | Galactic Infinity Ltd | Anjouan | 1 |
| Tipp24 DE tipp24.de | ZEAL Network SE (Lotto24) | Germany | 1 |
| tipp3 tipp3.at | Casinos Austria AG | — | 1 |
| Tippmix tippmix.hu | Szerencsejáték Zrt. | Hungary | 1 |
| Tipsport tipsport.cz | Tipsport | Czechia, Slovakia | 2 |
| Tiptorro DE tiptorro.de | Tiptorro (Torro Tec) | Germany | 2 |
| Tipwin tipwin.com | Tipwin | Sweden, Denmark, Germany | 5 |
| Titan Play (Ontario) titanplay.ca | Shark77 (Titanplay) | Canada | 1 |
| Titanbet titanbet.com.au | TitanBet Australia (independent bookmaker) | Australia VGCCC (Victoria) | 1 |
| TivoBet closed tivo.bet.br | Fast Gaming S.A. | Brazil SPA (Ministry of Finance) | 1 |
| Tivoli Casino tivolicasino.dk | Danske Spil A/S | Denmark | 1 |
| TodoSlots todoslots.es | Grupo Orenes | Spain | 1 |
| Tokyo tokyo.cz | 3E Projekt, a.s. (Tokyo) | Czechia | 1 |
| tombola tombola.co.uk | Flutter Entertainment plc | UKGC, Sweden, Denmark | 5 |
| tombola arcade tombolaarcade.co.uk | Flutter Entertainment plc | UKGC, Sweden, Denmark | 1 |
| TonyBet tonybet.com | TonyBet | Estonia, Netherlands, Kahnawake | 6 |
| ToonieBet (Ontario) tooniebet.ca | Soft2Bet | Canada | 1 |
| Topbet topbet.au | Betsmarter Group (TopBet) | Australia Liquor & Gaming NSW | 1 |
| Topbet SA topbet.co.za | Not identified | Uganda, South Africa Western Cape | 2 |
| TopBet Serbia topbet.rs | TopBet | Serbia | 1 |
| Toppz (Ontario) toppz.ca | White Hat Gaming | Canada | 1 |
| TopSport (AU, topsport.com.au) closed topsport.com.au | Betr Entertainment Limited (formerly BlueBet Holdings) | Australia Tasmanian Liquor and Gaming Commission | 1 |
| TOPsport (Lithuania, topsport.lt) topsport.lt | TOPsport | Lithuania | 1 |
| TopWin topwin.bg | Golden City 7 (TopWin) | Bulgaria | 1 |
| ToraTora Casino toratoracasino.com | ToraTora Entertainment Inc. | — | 1 |
| Total Casino totalcasino.pl | Totalizator Sportowy | Poland | 1 |
| Totalbet totalbet.pl | Totalbet | Poland | 1 |
| Tote tote.co.uk | UK Tote Group | UKGC, Ireland | 1 |
| TOTO toto.nl | Nederlandse Loterij | Netherlands | 1 |
| Toto Estonia toto.ee | MTÜ Tallinna Hipodroom | Estonia | 1 |
| Toto.bg toto.bg | Bulgarian Sports Totalizator | Bulgaria | 1 |
| TotoGaming Romania totogaming.ro | TotoGaming | Romania | 1 |
| Totosi (IT) totosi.it | Lottomatica Group | Italy | 1 |
| Touchcasino (KGC) touchcasino.com | Starscream Limited | Kahnawake | 1 |
| Tradicional closed tradicional.bet.br | Blow Marketplace Ltda | Brazil SPA (Ministry of Finance) | 1 |
| TradieBET tradie.bet | Bonus Kingdom (TradieBET) | Australia VGCCC (Victoria) | 1 |
| Traf trafonline.pl | Traf - Zakłady Wzajemne | Poland | 1 |
| Treasure Mile Casino treasuremile.com | TD Investments Ltd | Kahnawake | 1 |
| Trickz trickz.com | Hitz Gaming OÜ | Estonia | 2 |
| Trino Casino trinocasino.co | Buscarar SRL | Anjouan | 1 |
| Triobet triobet.lv | Betsson AB | Latvia | 1 |
| Trip2Vip trip2vip.com | Dama N.V. / Novatrix SRL network | Tobique, Anjouan | 1 |
| Tropicana Online Casino tropicanacasino.com | Caesars Entertainment | US state | 1 |
| Tropino closed tropino.bet.br | Estadox Ltda | Brazil SPA (Ministry of Finance) | 1 |
| Trotto DE trotto.de | Berliner Trabrenn-Verein e.V. | Germany | 1 |
| TrueBet truebet.com.au | TrueBet (independent bookmaker) | Australia VGCCC (Victoria) | 1 |
| TrustDice trustdice.win | Satoshi Gaming Group N.V. (TrustDice) | Curaçao | 1 |
| Tsars Casino tsars.com | Trink N.V. | Anjouan | 1 |
| Turbonino turbonino.com | SkillOnNet | UKGC, MGA, Sweden | 2 |
| TurboVegas turbovegas.com | Gameday Group (Together Gaming / Bethard) | MGA, Sweden | 1 |
| Tuzoca tuzoca.es | Not identified | Spain | 1 |
| TV Bingo tvbingo.dk | SIFA (Samvirkende Idræts-Foreninger Aalborg) | Denmark | 1 |
| Twin twin.com | Jade Reef Ventures Corp. (Leon, Twin) | Anjouan | 1 |
| Twinsbet twinsbet.lt | UAB Nesė | Lithuania | 1 |
| TwinSpires Sports & Casino PA closed twinspires.com | Churchill Downs Incorporated | US state | 1 |
| Two Fat Ladies twofatladies.co.uk | Broadway Gaming Group | UKGC | 1 |
