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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
• Surrogate partner therapist, 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

• Disambiguation pages