| ริบ | ripH | verb | to confiscate; to appropriate |
| attributive verb | [is] sharp |
| ริบบิ้น | ripH binF | noun, loanword, English | [Thai transcription of the foreign loanword, "ribbon"] |
| ริบหรี่ | ripH reeL | attributive verb | (of light) [is] dim; flickering; faded; faint |
 ริม  | rimM | noun | edge; rim |
| preposition | by; beside; alongside; at the side of |
ริมคลอง | rimM khlaawngM | noun | edge of a canal; next to the canal |
| ริมถนน | rimM thaL nohnR | noun | roadside; side of a road |
| ริมธารน้ำในป่า | rimM thaanM naahmH naiM bpaaL | preposition, phrase | by or beside a brook in the woods |
| ริมน้ำ | rimM naahmH | noun | waterfront |
| ริมฝีปาก | rimM feeR bpaakL | noun | lip |
| ริมแม่น้ำ | rimM maaeF naahmH | noun | edge of a river |
| ริยาด | riH yaatF | proper noun, geographical | Riyadh, the capital city of ซาอุดิอาระเบีย (Saudi Arabia) |
| ริลอง | riH laawngM | verb, transitive, phrase, colloquial | to try something risky |
| ริ้ว | riuH | adjective | shredded |
| noun | line; molding; stripe; straight marking |
| ริษยา | ritH saL yaaR | noun | envy |
| verb | to envy |
| ริอ่าน | riH aanL | verb, phrase | to initiate; to begin to plan; to originate plans |
| รี | reeM | adjective | oblong; oval |
| verb | to wait for; delay |
| prefix, loanword, English | [Thai transcription of the foreign loanword, "re-", the English prefix] |
| รี่ | reeF | verb, adverb | to head straight for; directly |
| noun | [same as ลี่] |
| รี ๆ รอ ๆ | reeM reeM raawM raawM | attributive verb | [is] hesitant; uncertain; wavering; reluctant |
| รีคอร์เดอร์ | reeM khaaw[r]M duuhrM | noun, loanword, English | [Thai transcription of the foreign loanword, "recorder"] |
| รีเจนต์ | reeM jaehn[d]M | noun, loanword, English | [Thai transcription of the foreign loanword, "Regent"] |
| รีด | reetF | verb | to iron; to squeeze; to press; wash; launder |
| verb | to abort or miscarry a fetus |
| รีดไถ | reetF thaiR | verb | to squeeze; extort; extract |
| รีดนม | reetF nohmM | verb, transitive | to milk a cow |
| รีดผ้า | reetF phaaF | verb | to iron clothes |
| รีดลูก | reetF luukF | verb, intransitive | to abort or miscarry a fetus, to have an abortion or miscarriage |
| รีต | reetF | noun | custom; tradition; ritual; convention |
| verb | [of a religion] to convert (to) |
| verb | [เข้ารีต] [of a religion] to convert (to); to join a sect |
| รีเทิร์น | reeM theernM | noun, verb, transitive, intransitive, colloquial, English | [Thai transcription of the foreign loanword, "return"] |
| รีบ | reepF | verb | hurry |
| รีบร้อน | reepF raawnH | adjective | in a hurry; rushed |
| รีบเร่ง | reepF rehngF | verb | to hurry or rush, in a hurry |
| รีบออกไป | reepF aawkL bpaiM | verb | to hurry off |
| รีฟส์ | reef[s]F | proper noun, person, loanword, English | [Thai transcription of the foreign loanword, "Reeves"] |
| รีโมท | reeM mohtF | noun, loanword, English | [Thai transcription of the foreign loanword, "remote"] a remote control |
รีโมทคอนโทรล  | reeM mohtF khaawnM throhnM | noun | remote control |
| รีรอ | reeM raawM | verb | to delay; to hesitate; to wait (for); to pause; to hold back |
| รีรีข้าวสาร | reeM reeM khaaoF saanR | noun, proper noun, phrase, colloquial | [name of a traditional Thai game/entertainment in the past] |
| รีสอท์ | reeM saaw[t]R | | [alternate spelling of รีสอร์ต] |
| รีสอร์ต | reeM saaw[r]dL | noun, loanword, English | [Thai transcription of the foreign loanword, "resort"] |
| รึ | reuH | conjunction, colloquial | [colloquial shortening of] หรือ , [the word] or |
| particle, colloquial | [a particle indicating a question, informal pronunciation of] หรือ |
| รึเปล่า? | reuH bplaaoL | phrase, colloquial | [colloquial form of หรือเปล่า] ...or not? |
| รึยัง | reuH yangM | conjunction, phrase, colloquial | [a colloquial way of saying] หรือยัง; "or not" [often shortened to only ยัง ] |
| รื่น | reuunF | attributive verb | [is] joyful; joyous; (feeling) fresh or refreshing; comfortable; enjoyable |
| adjective | [is] smooth; trouble-free |
| proper noun, person, formal, colloquial | Rune [a Thai male or female given name or nickname] (happy, refreshing) |
| รื่นรมย์ | reuunF rohm[y]M | | [is] happy; pleasant; refreshed |
| รื่นเริง | reuunF reerngM | attributive verb | [is] cheerful; merry; jovial; hilarious |
| รื่นฤดี | reuunF reuH deeM | proper noun, geographical, person, phrase, formal | Rune Rudee [name of a ซอย (soi) in กรุงเทพฯ (Bangkok)]; [a Thai female given name] |
| รื่นหู | reuunF huuR | adjective, phrase, colloquial | euphonious; euphonic; euphonical |
| รื้อ | reuuH | verb | to demolish; raze; dismantle; take down |
| รุ | rooH | verb, transitive | to evacuate; to purge; to discard |
| noun | laxative |
| รุก | rookH | verb, transitive, intransitive, formal, colloquial | to attack; to invade; to advance; to infringe; to violate; to encroach; to enter with an army; to check (as in checkmate) |
| verb | push; shove; jostle |
| รุกข | rookH khaL | noun, adjective, loanword, Pali | tree, plant; of or relatinig to trees or plants |
