Ratio (disambiguation)

A ratio is a relationship between numbers or quantities.

Ratio may also refer to:
 * Ratio (journal), a philosophical quarterly
 * Ratio, Arkansas, a community in the United States
 * Ratio decidendi, a legal concept
 * Ratio Institute, a Swedish institute
 * Ratio scale, a statistical level of measurement
 * Ratio, a 2009 book on cooking by Michael Ruhlman
 * 'Ratio' as a term used on the social media website Twitter