Linguistic profiling is the practice of identifying the social characteristics of an individual based on auditory cues, in particular dialect and accent. The theory was first developed by Professor John Baugh to explain discriminatory practices in the housing market based on the auditory redlining of prospective clientele by housing administrators. Linguistic profiling extends to issues of legal proceedings, employment opportunities, and education. The theory is frequently described as the auditory equivalent of racial profiling. The bulk of the research and evidence in support of the theory pertain to racial and ethnic distinctions, though its applicability holds within racial or ethnic groups, perceived gender and sexual orientation, and in distinguishing location of geographic origin.
Baugh's theory is distinct from linguistic profiling as defined by Hans van Halteren from the University of Nijmegen in the Netherlands. Van Halteren's theory deals with the categorization of linguistic features for the purposes of author identification and verification from a text, not necessarily specifically addressing the socially defined categories within which they are included.
An important distinction exists between the many uses of linguistic profiling and the potential for discriminatory treatment. The power to determine origin or racial identity based on speech can be utilized without overt discrimination, as argued in several court cases where voice was used in the prosecution of a suspect. The negative effects of linguistic profiling are seen in the practice of denying housing or employment based on stereotypes associated with dialect and/or accent. Further negative practices are associated with education and general treatment of individuals speaking stigmatized dialects. A more positive view of the practice is found in Baugh's description of expressions of ethnic pride. Though average people have been shown to be well equipped in measuring social characteristics by means of speech, the failings of those unfamiliar with a speech community and the capability of manipulation of speech should be taken into account when determining the unbiased use of linguistic profiling.