| บิลลี่ | binM leeF | | [alternate spelling of บิลลี] |
| บิลิซี | biL liH seeM | | [alternate spelling of ทบิลิซี] |
| บิสเคค | bitL khaehkF | | [alternate spelling of บิชเคก] |
| บิสซู | bitL suuM | | [alternate spelling of บิสเซา] |
บิสเซา  | bitL saoM | proper noun, geographical | Bissau, the capital city of กินีบิสเซา (Guinea Bissau) |
| บิสมาร์ค | bitL maa[r]kF | proper noun, geographical | Bismarck, the capital city of ดาโกตาเหนือ (North Dakota) |
| บี | beeM | | [Thai pronunciation of the English letter,] 'B' |
| บี้ | beeF | verb, transitive, intransitive | to crush |
| attributive verb | [is] crushed; flattened |
| บี เอส | beeM aehtL | noun, interjection, vulgar, loanword, English | [Thai transcription of the foreign loanword, "bs," "b.s."] bullshit |
| บีช | beetL | noun, loanword, English | [Thai transcription of the foreign loanword, "beach"] |
| noun, adjective, loanword, English | [general] beech |
| noun | [ต้นบีช] beech tree |
| บีฑา | beeM thaaM | verb, loanword, Sanskrit | to suppress; oppress |
| noun, loanword, Pali, Sanskrit | harm; pain; suffering; injury; damage |
| บีทียู | beeM theeM yuuM | noun | B.T.U.; British thermal unit |
| บีทีเอ็ส | beeM theeM esH | proper noun | BTS, [referring to] the Bangkok Skytrain |
| บีบ | beepL | verb | to squeeze; squash; compress; press; compel |
| verb | wring; wring out |
| บีบคอ | beepL khaawM | verb | to choke or strangle a person at the throat |
| บีบคั้น | beepL khanH | verb | to oppress; press |
| บีบแตร | beepL dtraaeM | verb | to blow a horn |
| บีบน้ำตา | beepL nahmH dtaaM | verb, intransitive, phrase, figurative, colloquial, sarcastic-humorous | to shed or cry crocodile tears |
| บีบบังคับ | beepL bangM khapH | verb | to coerce; to exact |
| บีบีซี | beeM beeM seeM | proper noun, loanword, English | BBC |
| บีเวอร์ | beeM wuuhrM | noun, loanword, English | [Thai transcription of the foreign loanword, "beaver"] |
| บีฬา | beeM laaM | noun | [same as บีฑา] |
| บีเอ็มดับเบิลยู | beeM emM dapL beernM yuuM | proper noun, loanword, English | [Thai transcription of the foreign loanword, "BMW"] |
บึก  | beukL | noun | [ปลาบึก] Mekong giant catfish, Pangasianodon gigas |
| บึกบึน | beukL beunM | | [physical] tough; strong; stout; [mental] doughty; unyielding; resolute; insistent; stubborn; tenacious |
| บึง | beungM | noun | swamp |
| บึ้ง | beungF | adjective | serious; sullen; solemn; grave |
| บึ้งตึง | beungF dteungM | attributive verb | [is] sullen |
| บึ้ม | beumF | colloquial, onomatopoeia | [explosion] bang! |
| adjective, colloquial, idiom | [used with woman's breasts] [slang] huge; big |
| บื้อ | beuuF | adjective, colloquial, sarcastic-humorous | [showing insult and disapproval] slow, delayed, tardy; stupid, braindead, dense, dim, dozy (British informal), dull-witted, obtuse, retarded, thick |
| บุก | bookL | verb | to penetrate; invade; overrun; advance by force |
| บุกกิง | bookL gingM | noun, loanword, English | [Thai transcription of the foreign loanword, "booking"] |
| บุกเบิก | bookL beerkL | verb, transitive, intransitive, phrase, formal | to pioneer |
| บุกรุก | bookL rookH | verb | to intrude; trespass |
| บุ๊ค | bookH | verb | book (reserve a seat, ticket) |
 บุคคล | bookL khohnM | noun | person; individual; man; commoner |
| noun | [Philosophy] a being |
| บุคคลวัต | bookL khohnM watH | noun, phrase, formal, loanword, Pali | [current form of บุคลาธิษฐาน] |
| บุคคลสัญชาติเยอรมันในประเทศไทย | bookL khohnM sanR chaatF yuuhrnM manM naiM bpraL thaehtF thaiM | phrase | a German national in Thailand |
| บุคคลสำคัญมาก | bookL khohnM sahmR khanM maakF | noun | VIP; V.I.P.; very important person |
| บุคคลหรือสิ่งที่คนสาปแช่งหรือเกลียดชัง | bookL khohnM reuuR singL theeF khohnM saapL chaaengF reuuR gliiatL changM | noun, phrase, formal | anathema; the excommunicated; the cursed |
| บุคคลหรือสิ่งที่ทำให้เบิกบานใจมาก | bookL khohnM reuuR singL theeF thahmM haiF beerkL baanM jaiM maakF | noun, phrase | an amusing thing "a gas" |
| บุคคลากร | bookL khaH laaM gaawnM | noun | personnel; staff; crew |
| บุ๊คมาร์ค | bookH maa[r]kF | loanword | [Thai transcription of the foreign loanword, "bookmark"] |
| บุคลากร | bookL khaH laaM gaawnM | | [alternate spelling of บุคคลากร] |
| บุคลาธิษฐาน | bookL khaH laaM thitH saL thaanR | noun, formal, loanword, Sanskrit | personification |
| บุคลิก | bookL khaH likH | noun | personality; characteristics of a person |
| บุคลิกภาพ | bookL khaH likH phaapF | noun | personality; characteristics of a person |
| บุคลิกลักษณะ | bookL khaH likH lakH saL naL | noun | personality |
| บุคลิกหลุดโลก | bookL khaH likH lootL lohkF | noun | eccentric personality |
| บุ้ง | boongF | noun, proper noun | hairy caterpillar |
| proper noun | rasp; rasp-cut file; large coarse-toothed file |
| noun, proper noun, colloquial | [ผักบุ้ง] [colloquial term for] ผักทอดยอด |
