Bert Vaux (/vɔːks/;[1] born November 19, 1968) is an American linguist, currently a professor of phonology and morphology at the University of Cambridge.

Vaux specializes in phonological theory, dialectology, field methodology, and languages of the Caucasus.

Vaux was editor of the journal Annual of Armenian Linguistics from 2001 to 2006 and is co-editor of the book series Oxford Surveys in Generative Phonology.

Vaux's law (as labelled by Avery & Idsardi 2001, Iverson & Salmons 2003), which he first formulated in a 1998 article in Linguistic Inquiry, states that laryngeally unspecified – i.e. voiceless – fricatives become [GW]/[sg] ([Glottal Width]/[spread glottis]) in systems contrasting fricatives without reference to [GW]/[sg]; thus they are to be aspirated or, more technically, to be pronounced with a spread glottis.

[10] In 2005 he was interviewed in USA Today regarding the differences in regions of the United States about whether to call carbonated soft drinks "soda", or "pop", or "coke".