El análisis de audiencias o estudio de audiencias se define como el conjunto de métodos de investigación utilizados para obtener información sobre la audiencia, y que permite estimar el número de personas que han estado expuestos a un evento medial en un momento del tiempo determinado. Este puede referirse por ejemplo al consumo de un producto audiovisual, ya sea textual, sonoro, fotográfico o multimedia.

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Audience measurement measures how many people are in an audience, usually in relation to radio listenership and television viewership, but also in relation to newspaper and magazine readership and, increasingly, web traffic on websites. Sometimes, the term is used as pertaining to practices which help broadcasters and advertisers determine who is listening rather than just how many people are listening. In some parts of the world, the resulting relative numbers are referred to as audience share, while in other places the broader term market share is used. This broader meaning is also called audience research. Measurements are broken down by media market, which for the most part corresponds to metropolitan areas, both large and small.

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