ANNEX I LIST OF THIRD COUNTRIES WHOSE NATIONALS ARE REQUIRED TO BE IN POSSESSION OF A VISA WHEN CROSSING THE EXTERNAL BORDERS OF THE MEMBER STATES
Quoted from the source.
Before you go
Passport validity
Your passport must be valid for at least 3 months.
The travel document which a third-country national is using to enter Croatia must be valid for at least another three months after the planned departure from Croatia and issued within the previous 10 years
Tourist entry only
These rules cover tourist visits. Work, study and transit follow other rules.
The other way round
What Croatia passport holders need to visit Thailand.
Croatia passport Thailand
Visa-free · 30 days
Maximum stay
Up to 30 days
List of countries and territories whose nationals are entitled to Thailand's visa exemption scheme for the purpose of tourism for a period not exceeding 30 days Ordinary Passport 1. Australia 16. France 31. Latvia 46. Romania 2. Austria 17. Georgia 32. Liechtenstein 47. Saudi Arabia 3. Bahrain 18. Germany 33. Lithuania 48. Singapore 4. Belgium 19. Greece 34. Luxembourg 49. Slovakia 5. Bulgaria 20. Hungary 35. Malta 50. Slovenia 6. Bhutan 21. Iceland 36. Malaysia 51. South Africa 7. Brunei 22. India 37. Maldives 52. Spain 8. Canada 23. Indonesia 38. Netherlands 53. Sweden 9. Croatia 24. Ireland 39. New Zealand 54. Switzerland 10. Cyprus 25. Israel 40. Norway 55. Taiwan 11. Czechia 26. Italy 41. Oman 56. Türkiye 12. Denmark 27. Japan 42. Philippines 57. Ukraine 13. Estonia 28. Jordan 43. Poland 58. UAE 14. Fiji 29. Kuwait 44. Portugal 59. UK 15. Finland 30. Kyrgyzstan 45. Qatar 60. USA