Kláo, more commonly known by its Chinese transliteration Gelao, is a dialect cluster of Kra languages in the Kradai language family, spoken by the Gelao people in China and Vietnam. However, many people of the Gelao ethnic group no longer speak this language. The total number of speakers is estimated to be 3,000, of which 500 are monolinguals.
Ethnologue classifies Klao as four languages, perhaps as closely related to the two Lachi languages as they are to each other.