Most Popular Online Casinos in October
Terms & Conditions apply · Play responsibly
GambleZen Casino
Discover Nature’s Hidden Treasures with €3,625 in Your Backpack
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- ✓ Exclusive No-deposit Bonus – Available in Bulgaria and Selected Countries
- ✓ GambleZen Casino offers exclusive bonuses for CasinoBonusCenter visitors
- ✓ Bulgarian players are accepted
- ✓ Accepts Bitcoin and other cryptocurrencies
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- ✓ Mobile-friendly games · Enjoy playing on smartphones and tablets
- ✓ Live Casino · Play against real croupiers at GambleZen Casino
- ✓ Available in multiple languages, including English
- ✓ Tested and certified by Casino Bonus Center · Rating: 4.2/5
- ✓ 86 Game Providers: Platin Gaming, Ezugi, Onlyplay, OctoPlay, Fugaso, Pragmatic Play, LiveGames, XProGaming, KA Gaming, Evolution Gaming, Betsolutions, Playtech, and others.
Terms & Conditions apply · Play responsibly
Rollino
Enter the Fairground with an Exclusive Bonus up to €6,000!
- ✓ 20 Free Spins · No deposit required
- ✓ Exclusive No-deposit Bonus – Available in Bulgaria and Selected Countries
- ✓ Rollino offers exclusive bonuses for CasinoBonusCenter visitors
- ✓ Bulgarian players are accepted
- ✓ Play instantly in your browser – No installation required
- ✓ Mobile-friendly games · Enjoy playing on smartphones and tablets
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- ✓ Online sports betting
- ✓ Available in multiple languages, including English
- ✓ Tested and certified by Casino Bonus Center · Rating: 4.1/5
- ✓ 85 Game Providers: 1X2gaming, Platipus, Red Rake, Spinmatic, VIVO Gaming, High 5, Amatic, Pragmatic Play, Playbro, ThunderSpin, Barbara Bang, Thunderkick, and others.
Terms & Conditions apply · Play responsibly
KingSpin Casino
Join the Boss’s Inner Circle with a Tripled Starting Balance!
- ✓ Bulgarian players are accepted
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- ✓ Mobile-friendly games · Enjoy playing on smartphones and tablets
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- ✓ Available in multiple languages, including English
- ✓ Rating: 3.8/5
- ✓ 43 Game Providers: Gamomat, BF Games, StakeLogic, BRAGG, Relax Gaming, Leap Gaming, Red Rake, Blue Guru Games, ReelPlay, Skywind, Fantasma, Swintt, and others.
Terms & Conditions apply · Play responsibly
Merlin Casino
Feel the Spell of Big Wins with Wager-Free Bonuses, Free Spins & Daily Promotions
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- ✓ Merlin Casino offers exclusive bonuses for CasinoBonusCenter visitors
- ✓ Bulgarian players are accepted
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- ✓ Live Casino · Play against real croupiers at Merlin Casino
- ✓ Online sports betting
- ✓ Available in multiple languages, including English
- ✓ Rating: 3.9/5
- ✓ 125 Game Providers: Wizard Games, Peter and Sons, Betsolutions, Aviatrix, Yggdrasil Gaming, Eurasian Gaming, Nemesis, SpinLogic, Red Rake, Mr Slotty, UpGaming, Fazi Interactive, and others.
Terms & Conditions apply · Play responsibly
CasinoJoy
Join the tropical party vibes and claim a €6,000 Welcome Package!
- ✓ 20 Free Spins · No deposit required
- ✓ No-Deposit Free Spins Exclusive for New Players from Bulgaria and Selected Countries
- ✓ CasinoJoy offers exclusive bonuses for CasinoBonusCenter visitors
- ✓ Bulgarian players are accepted
- ✓ Accepts Bitcoin and other cryptocurrencies
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- ✓ Mobile-friendly games · Enjoy playing on smartphones and tablets
- ✓ Live Casino · Play against real croupiers at CasinoJoy
- ✓ Online sports betting
- ✓ Available in multiple languages, including English
- ✓ Tested and certified by Casino Bonus Center · Rating: 4.1/5
- ✓ 75 Game Providers: BetSoft, Leander Games, Ezugi, Evolution Gaming, VIVO Gaming, Pascal Gaming, Relax Gaming, Betradar, Fugaso, Habanero, Gamzix, Amusnet, and others.
Terms & Conditions apply · Play responsibly
Uptown Aces
$10 Free to try the games · Welcome bonus up to $2,500 whit No-max cashout!
- ✓ $10 free! No deposit required
- ✓ Bonus Code: UPTOWN10
- ✓ Bonus Code: UNPACK
- ✓ Bulgarian players are accepted
- ✓ Today’s Biggest Jackpot: $1,716,584 · Game: Aztec's Millions
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- ✓ Mobile-friendly games · Enjoy playing on smartphones and tablets
- ✓ Uptown Aces is available in English
- ✓ Tested and certified by Casino Bonus Center · Rating: 3.2/5
- ✓ Games Provider: SpinLogic
Terms & Conditions apply · Play responsibly
Sloto Cash
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- ✓ Bonus Code: 31FREE
- ✓ Bonus Code: SLOTO1MATCH
- ✓ Sloto Cash offers exclusive bonuses for CasinoBonusCenter visitors
- ✓ Bulgarian players are accepted
- ✓ Today’s Biggest Jackpot: $1,716,584 · Game: Aztec's Millions
- ✓ Accepts Bitcoin and other cryptocurrencies
- ✓ Play instantly in your browser – No installation required · Optional game downloads available
- ✓ Mobile-friendly games · Enjoy playing on smartphones and tablets
- ✓ Sloto Cash is available in English
- ✓ Tested and certified by Casino Bonus Center · Rating: 3.4/5
- ✓ Games Provider: SpinLogic
Top 10 Online Casino Bonuses in Bulgaria (October 2025)
Expert-Rated Real Money Casinos with Top Bonuses
Looking for the best online casinos in Bulgaria? Our expert team has tested and reviewed hundreds of real money gambling sites to bring you the top 10 choices for October 2025. GambleZen Casino, Zodiac Casino, and Grand Mondial lead our rankings, standing out for their extensive selection of high-paying slots, immersive live dealer tables, exclusive bonuses, and lightning-fast payouts.
Most Popular Online Casinos in Bulgaria
Curious which brands stand out among Bulgarian players right now? Here are the top 3 most popular online casinos in the last 30 days—each trusted for their excellent bonuses, diverse games, and reliable payouts:
- GambleZen Casino – Ranked as the #1 most popular online casino among Bulgarian players this month. Check why GambleZen Casino is so popular in Bulgaria
- SpinCity – Holds the second spot in popularity with Bulgarian players for October 2025. See Current Bonuses at SpinCity
- Sloto Cash – Currently ranked #3 among Bulgaria’s most played online casinos. View Available Promotions at Sloto Cash
Browse our expert-ranked list below and claim your exclusive welcome bonuses today!
| Online Casinos Bulgaria | Welcome Bonus |
|---|---|
GambleZen Casino €3,625 in Bonuses + 350 Free Spins | Bonus of 200% up to €500 + 100 Free Spins |
Zodiac Casino 80 chances to be a millionaire for €1 | 80 Free Spins |
Grand Mondial Get 150 chances to become a millionaire | 150 Free Spins |
SnatchCasino Casino Fun, Beach Vibes, Gangster Style | Bonus of 225% up to €1,000 + 100 Free Spins |
Immerion Casino & Sportsbook Built for Winners | Bonus of 100% up to $1,000 + 100 Free Spins |
SpinCity 30 Free Spins for Bulgarian Players! | Bonus of 200% up to €300 + 100 Free Spins |
Tsars An adventure-packed online сasino! | Bonus of 100% up to €300 + 100 Free Spins |
Captain Cooks Casino Get 100 Chances to be a Millionaire! | 100 Free Spins |
BetHog Get ready for a wild ride! | Bonus of 100% up to $5,000 |
Yukon Gold Casino 150 Chances to Win One Million Euros | 150 Free Spins |
* Terms & Conditions Apply · Play responsibly
With nearly two decades of experience in the industry, CasinoBonusCenter.com has been analyzing and comparing online casinos since 2006. Our dedicated team of professionals has handpicked the most trusted casinos for Bulgarian players to ensure you get the biggest sign-up bonuses, top-tier games, and the most rewarding loyalty programs.
