| อ่อน ๆ | aawnL aawnL | attributive verb | [is] very soft |
| อ่อนกำลัง | aawnL gahmM langM | attributive verb, adjective | [is] weak; tender; infirm; feeble |
อ่อนข้อ | aawnL khaawF | verb | admit the point; concede; yield; relent; submit (to) |
อ่อนใจ  | aawnL jaiM | attributive verb | [is] discouraged; downhearted |
| ออนซ์ | aawn[s]M | noun, classifier, loanword, English | [Thai transcription of the foreign loanword, "ounce"] |
| อ่อนนุช | aawnL nootH | proper noun, geographical | [ถนนอ่อนนุช] [name of a road and Skytrain station in Bangkok] On Nuuj, On Nuut, On Nut |
| อ่อนนุ่ม | aawnL noomF | adjective | soft |
| อ่อนเพลีย | aawnL phliiaM | adjective, phrase, formal | weak; exhausted; affable; obliging; enfeebled; worn out; drained; fatigued; tired out |
| อ่อนโยน | aawnL yohnM | adjective | [of people or a person] gentle; tender |
| อ่อนแรง | aawnL raaengM | attributive verb | [is] weak; tender; infirm; feeble |
| อ่อนลง | aawnL lohngM | verb | fade |
| อ่อนล้า | aawnL laaH | | [is] exhausted; weary; fatigued |
| ออนไลน์ | aawnM lai[n]M | noun, loanword, English | [Thai transcription of the foreign loanword, "on-line", "online"] |
| อ้อนวอน | aawnF waawnM | verb, transitive, intransitive, formal | to plead; to appeal; to whine; to wheedle; to try to obtain; to implore; to pray; to implore; to beg |
| อ่อนหวาน | aawnL waanR | adjective | sweet in manner; gentle |
| อ่อนหัด | aawnL hatL | adjective | inexperienced |
| อ่อนหู | aawnL huuR | attributive verb | [is] bored |
| อ่อนหู | aawnL huuR | verb | obey; comply |
| อ่อนไหว | aawnL waiR | adjective, phrase, formal | sensitive; receptive; given to quick changes in mood |
| อ่อนแอ | aawnL aaeM | adjective | weak (person, drink) |
| ออฟ | aawfL | loanword, English | [Thai transcription of the foreign loanword, "off"] |
| conjunction, loanword, English | [Thai transcription of the foreign loanword, "of"] |
| ออฟฟิศ | aawfL fitH | noun, loanword, English | [Thai transcription of the foreign loanword, "office"] |
| ออฟไลน์ | aawfL lai[n]M | | [Thai transcription of the foreign loanword, "off-line", "offline"] |
 ออม | aawmM | verb | to conserve; save; economize |
| อ่อม | aawmL | noun | [a type of] Thai curry |
| อ้อม | aawmF | verb | to encircle, approach by an indirect or roundabout route, to detour towards |
| adjective | roundabout; winding |
| noun, proper noun, geographical | [แม่น้ำอ้อม] the Om River in นนทบุรี (Nonthaburi province) |
| อ้อมแขน | aawmF khaaenR | noun | embrace |
| อ้อมค้อม | aawmF khaawmH | adjective | in a roundabout or indirect way |
| ออมชอม | aawmM chaawmM | verb | to compensate; be in good terms with; to compromise; to reach agreement and proceed on good terms |
| ออมทรัพย์ | aawmM sap[y]H | noun, phrase, formal | savings |
| ออมสิน | aawmM sinR | noun, proper noun, phrase, formal | savings; [name of the Government Savings Bank of Thailand] |
| อ่อย | aawyL | verb | to scatter bait; lure with bait; drop bait |
| verb | induce; persuade |
| อ้อย | aawyF | noun | [ต้นอ้อย] sugarcane, Saccharum officinarum |
| noun | [น้ำอ้อย] sugarcane juice |
| อ๋อย | aawyR | adjective | intense; bright |
| adverb | intensely; brightly |
| interjection, colloquial, onomatopoeia | [interjection of pain] "Ow!" "Ouch!" |
| อ้อยควั่น | aawyF khwanF | verb | [same as ควั่นอ้อย] |
| ออยเลอร์ | aawyM luuhrM | proper noun, person | Euler |
| อ้อยส้อย | aawyF saawyF | adjective, adverb | lingeringly and pretentiously doleful and woebegone for others' sympathy |
| อ้อยอิ่ง | aawyF ingL | adjective, adverb | slowly (in doing something) as if unwilling |
| ออรัล | aawM ranM | adjective, loanword, English | [Thai transcription of the foreign loanword, "oral"] |
| ออรัลเซ็กส์ | aawM ranM sek[s]H | noun, phrase, loanword, English | [Thai transcription of the foreign loanword, "oral sex"] |
| ออลบานี | aawnM baaM neeM | proper noun, geographical | Albany, the capital city of นิวยอร์ก (New York) |
| ออสติน | aawtL dtinM | proper noun, geographical | Austin, the capital city of เท็กซัส (Texas) |
| ออสเตรเลีย | aawtL dtraehM liiaM | proper noun, geographical, adjective | Australia; Austrailian |
| proper noun, geographical | [ประเทศออสเตรเลีย] Australia |
| ออสเตรีย | aawtL dtriiaM | proper noun, geographical, adjective | Austria; Austrian |
| proper noun, geographical | [ประเทศออสเตรีย] Austria |
| ออสโล | aawtL lohM | proper noun, geographical | Oslo, the capital city of นอรเวย์ (Norway) |
| อะ | aL | | [pronunciation of the Thai short vowel -ะ /-a/ ] |
| อ๊ะ | aH | | [an interjection used to express surprise] Ha? |
| อะโกโก้ | aL gohM gohF | | A-Go-Go |
| อะครึ่งเสียง | aL khreungF siiangR | noun | [literally "-ah half-sound"] [a grammatical practice in Thai whereby some Pali or Sanskrit words are pronounced with an extra '-a' sound when compounded into multi-syllable words] |
| อะซาเลีย | aL saaM liiaM | noun, loanword, English | [Thai transcription of the foreign loanword, "azalea"] |
| noun | [ดอกอะซาเลีย] azalea |
