A surrogate is a substitute or deputy for another person in a specific role and may refer to: Relationships Surrogacy, an arrangement where a woman agrees to carry and give birth to a child for another person who will become its parent at birth Sexual surrogate, in sexual therapy Surrogate marriage, a custom in Zulu culture Economics Ersatz, an artificial replacement differing in kind from and inferior in quality to what it replaces. Surrogation, a psychological phenomenon in management science Arts Author surrogate or audience surrogate, reciprocal literary techniques The Surrogates, a comic book series Surrogates (film), a 2009 film based on the comic book series The Surrogate (1984 film), a Canadian erotic film starring Art Hindle The Surrogate (1995 film), a TV movie starring Alyssa Milano The Surrogate (2020 film), an American LGBT-related Independent drama film The Surrogate, original title of The Sessions, a 2012 film starring John Hawkes, Helen Hunt, and William H. Macy "Surro-Gate", an episode of the cartoon series American Dad! "The Surrogate" (The Outer Limits), an episode of the 1990s version of The Outer Limits series Surrogate Paintings, a series by American artist Allan McCollum Science and technology Surrogate model, used in engineering design Surrogate endpoint, a measure of effect in clinical trials Surrogate key, a unique database identification key Surrogate proxy, a type of server network setup Surrogate mechanism, which allows UTF-16 to represent Unicode code points beyond the Basic Multilingual Plane as a pair of surrogate code points Surrogate data testing, a technique for identifying possible nonlinearity in data. Surrogate, used in library science. Metadata is created to represent information resources. The metadata serves as the surrogate for stored information resources. Surrogate species, used in ecology and conservation biology to indicate the following: Flagship species, chosen to support the marketing of a conservation effort Indicator species, which reveals the qualitative status of the environment Keystone species, which has a large effect on its environment Sentinel species, used to detect risks to humans by providing advance warning of a danger Umbrella species, whose protection indirectly protects many other species sharing its habitat Other uses Surrogate (clergy), a deputy of a bishop or ecclesiastical judge Surrogate Court, a court primarily concerned with the distribution of assets of a decedent Surrogate alcohol, a substance containing alcohol that is consumed, though it is not meant for human consumption