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There are several different Lao romanization systems, i.e. transcriptions of the Lao alphabet in the Latin alphabet.

Contents 1 History 2 Tables 2.1 Consonants 2.2 Vowel nuclei 3 References and external links

One standard system was devised in the first half of the 20th century when Laos was a French protectorate. There are two important factors that govern the way Lao - as opposed to Thai or Isan - was transcribed in that system. The first is that the Lao script does not render characters that are not pronounced. This standard was put into place via a royal edict. The idea was both to make it easier for non-ethnic Laotians to read and write Lao, and to differentiate Lao from Thai, which does render characters that are not pronounced. The second factor is that the French system for transcribing sounds was used, hence "ou," for example, instead of "oo" (or "u") for an oo sound. If not for these two factors, Lao and Thai romanization would appear very similar.

The French transcription system is reflected by the BGN and PCGN standards. (See below.)

The table below shows the Lao consonant letters with their phonetic value in the International Phonetic Alphabet (IPA), and transcriptions according to the US Board on Geographic Names and the British Permanent Committee on Geographical Names (BGN/PCGN), the US Library of Congress (ALA/LC) and the transcriptions used in the Unicode names of the letters.

character	IPA	BGN/PCGN	ALA/LC	Unicode
ກ	k	k	k/k	k
ຂ	kʰ	kh	kh/k	kh
ຄ	kʰ	kh	kh/k	kh
ງ	ŋ	ng	ng/ng	ng
ຈ	ʧ	ch	ch/t	c
ສ	s	s	s/t	s
ຊ	s	x	s/t	s
ຍ	ɲ	gn/y	ny/—	ny
ດ	d	d/t	d/t	d
ຕ	t	t	t/t	t
ຖ	tʰ	th	th/t	th
ທ	tʰ	th	th/t	th
ນ	n	n	n/n	n
ບ	b	b/p	b/p	b
ປ	p	p	p/p	p
ຜ	pʰ	ph	ph/p	ph
ຝ	pʰ	f	f/p	f
ພ	pʰ	ph	ph/p	ph
ຟ	f	f	f/p	f
ມ	m	m	m/m	m
ຢ	j	y	y	y
ຣ	l	r	r	l
ລ	l	l	l	l
ວ	w	v/o	v	w
ຫ	h	h	h	h
ອ	—	—		o
ຮ	h	h	h	h

The table below shows the Lao vowel nuclei, combined with the consonant ກ.

	IPA	BGN	LC	Unicode		IPA	BGN	LC	Unicode		IPA	BGN	LC	Unicode		IPA	BGN	LC	Unicode
ກະ/ກັກ	/a/	a	a	a	ກາ	/aː/	a	ā	aa
ກິ	/i/	i	i	i	ກີ	/iː/	i	ī	ii	ເກັຽະ/ກັຽກ	/iə/	ia	ia		ເກັຽ/ກຽກ		ia	īa
ກຶ	/ɯ/	u	ư	y	ກື	/ɯː/	u	ư̄	yy	ເກຶອະ/ເກຶອກ	/ɯə/	ua	ưa		ເກືອ		ua	ư̄a
ກຸ	/u/	ou	u	u	ກູ	/uː/	ou	ū	uu	ກົວະ/ກັວກ	/uə/	oua	ua		ກົວ/ ກວກ		oua	ūa
ເກະ/ເກັກ	/e/	é	e		ເກ	/eː/	é	ē	e
ແກະ/ແກັກ	/ɛ/	è	æ		ແກ	/ɛː/	è	ǣ	ei
ໄກະ/ກົກ	/o/	ô	o		ໄກ	/oː/	ô	ō	o
ເກາະ/ກັອກ	/ɔ/	o	ǫ		ກໍ/ກອກ	/ɔː/	o	ǭ
ເກິະ/ເກິກ	/ɤ/	eu	œ		ເກີ/ ເກືກ	/ɤː/	eu	œ̄
									ໂກ/ໃກ/ກັຢ	/ai/	ai	ai	ai/ay	ກາຢ/ກາຽ		/ai/	āi
ເກົາ	/au/	ao	ao
ກໍາ	/am/	am	am	am

• Report on the current status of United Nations romanization systems for geographical names - Lao (PDF; this document refers to the Lao Commission Nationale de Toponymie. There is no Lao romanization system officially adopted by the UN.)
• Library of Congress romanization table for Lao (PDF)
• Unicode code chart for Lao
• ANSI Z39.35-1979, System for the Romanization of Lao, Khmer, and Pali; ISBN 0-88738-968-6.