A surrogate is a substitute or deputy for another person in a specific role and may refer to:

Relationships

Surrogacy Surrogacy is an arrangement, often supported by a legal agreement, whereby a woman agrees to delivery/labour for another person or people, who will become the child's parent(s) after birth. People may seek a surrogacy arrangement when pregnan ...

, 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 Sex surrogates, sometimes referred to as surrogate partners, are practitioners trained in addressing issues of intimacy and sexuality. A surrogate partner works in collaboration with a sex therapist to meet the goals of their client. This triadic ...

, in sexual therapy *

Surrogate marriage A surrogate marriage describes the arrangement where a woman is infertile or dies young and her family substitutes another woman to bear children for the husband. Cultural roots Surrogate marriages exist in some African cultures, such as the Zulu ...

, a custom in Zulu culture

Economics

Ersatz An ersatz good () is a substitute good, especially one that is considered inferior to the good it replaces. It has particular connotations of wartime usage. Etymology ''Ersatz'' is a German word literally meaning ''substitute'' or ''replacement ...

, an artificial replacement differing in kind from and inferior in quality to what it replaces. *

Surrogation Surrogation is a psychological phenomenon found in business practices whereby a measure of a construct of interest evolves to replace that construct. Research on performance measurement in management accounting identifies surrogation with "the te ...

, a psychological phenomenon in management science

Arts

Author surrogate As a literary technique, an author surrogate (also called an author avatar) is a fictional character based on the author. The author surrogate may be disguised, with a different name, or the author surrogate may be quite close to the author, with ...

audience surrogate A narrative technique (known for literary fictional narratives as a literary technique, literary device, or fictional device) is any of several specific methods the creator of a narrative uses to convey what they want —in other words, a stra ...

, reciprocal literary techniques *

The Surrogates ''The Surrogates'' is a five-issue comic book limited series written by Robert Venditti, drawn by Brett Weldele, and published by Top Shelf Productions from 2005 to 2006. In 2009 it was followed by a prequel graphic novel, ''The Surrogates: Fles ...

, 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 "Surro-Gate" is the seventh episode of the fourth season of ''American Dad!''. It originally aired on December 2, 2007. This episode mainly focuses on Stan, who hears the news that his gay neighbors Greg and Terry are planning on starting a fami ...

", 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 A surrogate model is an engineering method used when an outcome of interest cannot be easily measured or computed, so a model of the outcome is used instead. Most engineering design problems require experiments and/or simulations to evaluate design ...

, used in engineering design *

Surrogate endpoint In clinical trials, a surrogate endpoint (or surrogate marker) is a measure of effect of a specific treatment that may correlate with a ''real'' clinical endpoint but does not necessarily have a guaranteed relationship. The National Institutes of He ...

, a measure of effect in clinical trials * Surrogate key, a unique database identification key *

Surrogate proxy In computer networks, a reverse proxy is the application that sits in front of back-end applications and forwards client (e.g. browser) requests to those applications. Reverse proxies help increase scalability, performance, resilience and securi ...

, a type of server network setup *

Surrogate mechanism The Unicode Consortium and the ISO/IEC JTC 1/SC 2/ WG 2 jointly collaborate on the list of the characters in the Universal Coded Character Set. The Universal Coded Character Set, most commonly called the Universal Character Set ( UCS, offici ...

, 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 Metadata is "data that provides information about other data", but not the content of the data, such as the text of a message or the image itself. There are many distinct types of metadata, including: * Descriptive metadata – the descriptive ...

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 A bioindicator is any species (an indicator species) or group of species whose function, population, or status can reveal the qualitative status of the environment. The most common indicator species are animals. For example, copepods and other sma ...

, which reveals the qualitative status of the environment **

Keystone species A keystone species is a species which has a disproportionately large effect on its natural environment relative to its abundance, a concept introduced in 1969 by the zoologist Robert T. Paine. Keystone species play a critical role in maintaini ...

, 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

* Campaign surrogate, a politician or person of influence

campaigning Campaign or The Campaign may refer to: Types of campaigns * Campaign, in agriculture, the period during which sugar beets are harvested and processed *Advertising campaign, a series of advertisement messages that share a single idea and theme *Bli ...

for a presidential candidate * 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