15 Thai laws you didn't know could get you in trouble

Thailand, often called the Land of Smiles, is a beautiful country with a rich culture and relaxed atmosphere. But beneath that laid-back vibe are some surprising laws that could land you in trouble—especially if you're a foreigner unfamiliar with local rules.

At YIM Travel, we’ve spent years traveling throughout Thailand, and our goal is to help visitors enjoy their trip while staying safe and respectful. Whether it’s about dress codes, transportation, or unusual restrictions, we’ve seen tourists get fined or warned for things they had no idea were illegal.

Here are 15 surprising laws and rules to be aware of before your trip to Thailand in 2025.

1 Keep Your Bikini at the Beach

While Thailand has a relaxed dress code in many places, going commando (not wearing underwear) is technically illegal—even if you're fully dressed. It’s not enforced often, but it is on the books.

2 Keep Your Bikini at the Beach

Topless sunbathing or public nudity is strictly prohibited, even on touristy islands. Always cover up outside designated swimming areas.

3 Stop When You Hear the Anthem 

The national anthem plays twice daily in public spaces. Everyone is expected to stop walking and stand still—yes, even tourists. It's a sign of respect toward the monarchy.

4. Shirt On, Helmet On

When renting a scooter or motorcycle, you’re legally required to wear both a helmet and a shirt. No riding shirtless, even in beach towns.

5. Only One Set of Playing Cards Allowed

Bringing more than one deck of playing cards may raise eyebrows. Thai gambling laws are strict, and possessing more than 120 cards can be seen as intent to gamble.

6. You Must Speak Thai (Technically)

There’s a law that requires everyone in Thailand to speak Thai—but don't worry, it’s not enforced on tourists. Still, learning a few basic phrases is appreciated.

7. Don’t Hang Foreign Flags on Balconies 

Flying a foreign flag from your resort balcony might be seen as disrespectful or even illegal. Keep your patriotism private.

8. Don’t Spit or Drop Gum

Spitting out chewing gum in public is a finable offense in many Thai cities. Always dispose of trash properly.

9. Don’t Step on Thai Currency

Thai banknotes have the image of the king, and stepping on them (even accidentally) is considered highly disrespectful and can lead to serious consequences.

10. Don’t Dress as a Nurse

In Thailand, impersonating a nurse or medical professional is illegal—even as part of a party costume.

11. Durian Not Welcome

Durian, the pungent tropical fruit, is often banned in hotels and taxis due to its intense smell.

12. Don’t Eat While Walking (in Some Places)

While not strictly illegal everywhere, eating while walking is frowned upon in certain cities. It’s seen as disrespectful and messy. Use your meal as a moment to sit and enjoy.

13. Flip-Flops Law (Kind Of)

There are rumors that flip-flops are banned in public, but don’t worry—this isn’t true. Most Thais wear them daily. Just avoid wearing them on motorbikes or in temples.

14. Leave the E-Cigarette at Home!!!

E-cigarettes are banned in Thailand. Bringing them into the country or using them publicly can result in hefty fines or jail time.

15. Don’t Feed the Pigeons

Feeding pigeons is illegal in many public parks and tourist spots. It’s seen as a hygiene issue, and you may be fined.

Final Tips for Staying Safe

Thailand is welcoming, but unfamiliar laws can catch travelers off guard. If you're unsure, observe what locals do and when in doubt, ask politely.

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Written by Barry for YIM Travel

We’re a small travel blog with big ambitions—our dream is to move to Thailand in the next few years and live the travel lifestyle we write about. Follow our journey and learn from our firsthand tips as we build toward that dream.