Thailand doesn't have the firm 'leave food to show you're full' custom sometimes attributed to certain East Asian cultures, nor is a clean plate strictly required as a sign of respect. In practice, most Thais will simply be pleased you enjoyed the food. At shared-dish meals — which are common — you naturally take what you want and leave the rest in the communal dishes, so the concept of a 'clean plate' is less relevant anyway. Wasting large amounts of food unnecessarily can be seen as impolite, but finishing everything or leaving a small amount are both perfectly acceptable.
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Try the Local Etiquette & Taboos Checker →No, leaving some food is not considered rude in Thailand. There's no cultural expectation that you must finish everything to show respect or satisfaction. Just avoid wasting large quantities, which can seem careless anywhere.
Thai meals typically involve several dishes placed in the center of the table for everyone to share, eaten alongside individual portions of rice. You serve small amounts onto your own plate progressively rather than piling everything up at once, and it's normal for some food to remain in the shared bowls at the end.
A genuine verbal compliment — saying the food was delicious (อร่อย, 'aroi') — is always warmly received and more meaningful than any plate-finishing signal. Thais take pride in their food, and expressing that you enjoyed it is a simple, appreciated gesture.