# Chain (disambiguation)

A chain is a series of connected links which are typically made of metal.
Chain may also refer to:

## Accessories and apparel

* Chain mail, a type of armor made of interlocking chain links
* Jewellery chain (or necklace), a type of jewelry which is worn around the neck

## Places

* Chain Bridge (Budapest), a suspension bridge that spans River Danube between Buda and Pest
* Chain Bridge (Potomac River), a bridge across the Potomac River at Little Falls in Washington, D.C.
* Chains (geological site), a geological site on the north-west plateau of Exmoor, Somerset, England
* Union Chain Bridge, a bridge between Northumberland, England and Berwickshire, Scotland

## People with the name

* Ernst Chain (1906–1979), Nobel Prize-winning chemist famed for his isolation of penicillin
* John T. Chain Jr. (1934–2021), retired U.S. Air Force general

## Arts, entertainment, and media
### Films and television

* Chains (film), a 1949 Italian melodrama film
* Chains (Blackadder), a 1986 episode of the British sitcom Blackadder II
* Chains of Love (TV series), a 2001 American dating game show adapted from a Dutch television series
* Chain (film), a 2004 film written and directed by Jem Cohen
* Chains, a 2009 short film starring TNA wrestler Kurt Angle

### Literature

* Chains (play), a 1909 play by Elizabeth Baker
* Chain (play), a 1992 play by Pearl Cleage
* Chains (novel), a 2008 historical-fiction novel by Laurie Halse Anderson

### Music

* Chain (band), an Australian blues rock band active from the 1960s to the present

#### Albums

* Chain (Paul Haig album), 1989
* Chain (The Family Stand album), 1990
* Chain (Pylon album), 1990
* Chains (album), by Yōko Oginome, 1997
* Chain (Bonnie Pink EP), 2008
* Chain (KAT-TUN album), 2012
* Chain (NCT 127 EP), 2018

#### Songs

* "Chains" (Cookies song), 1962, covered by The Beatles
* "The Chain", a 1977 song by Fleetwood Mac
* "Chains", a song by Chicago from the 1982 album Chicago 16
* "Chains" (Patty Loveless song), 1990
* "Chains" (Tina Arena song), 1994
* "Chains" (DLT song), 1996
* "Chain", a song by the Fire Theft from their 2003 self-titled album
* "Chains" (Nick Jonas song), 2014
* "Chains" (Usher song), 2015
* "Chain", a song by His Boy Elroy

## Business and economics

* Chain (real estate), a group of buyers/sellers that are linked together
* Chain of command, the line of authority and responsibility along which orders are passed
* Chain store, a retail shop outlets which share a brand and central management
* Chained dollars, used to express real dollar amounts adjusted over time for inflation
* Cinema chain, or movie chain
* Cold chain, a temperature-controlled supply chain
* Fast food chain
* Hotel chain
* Restaurant chain
* Supply chain, a coordinated system of organizations, people, activities, information and resources involved in moving a product or service from supplier to customer
* Value chain, a management concept first described by Michael Porter

## Mathematics

* Chain (ordered set), a totally ordered set, usually a subset of a given partially ordered set
* Chain (algebraic topology), a formal linear combination of k-simplices
* Chain complex, a generalization of the algebraic topology construct to homological algebra
* Chain rule, a tool for differentiation in calculus
* Chain sequence, numbers in the mathematical study of continued fractions
* Conway chained arrow notation, a way of expressing exponents using arrows
* Jordan chain, a sequence of linearly independent generalized eigenvectors of descending rank
* Markov chain, a discrete-time stochastic process with the Markov property
* Pseudo-arc, which has at its heart the concept of a chain

## Mechanics, engineering, and implements

* Bar-link chain (or block chain), a mechanical drive chain
* Bicycle chain, a roller chain that transfers power from the pedals to the drive-wheel of a bicycle
* Buffers and chain coupler, a railway device
* Catenary (or chain), the shape of a hanging flexible cable when supported at its ends and acted upon by a uniform gravitational force
* Chain Home and Chain Home Low, early British RDF (radar) systems of the WWII era
* Chain tool, a small mechanical device used to "break" a bicycle chain in such a way that it could be mended with the same tool
* Conveyor chain, a chain that conveys items in chain conveyor systems
* Drive chain, a way of transmitting mechanical power from one place to another
* Print chain on a chain printer
* Roller chain, most commonly used for transmission of mechanical power
* Self-lubricating chain, to eliminate the need for further lubrication
* Snow chains or tire chains, devices fitted to the tires of vehicles to provide maximum traction
* Timing chain, part of an internal combustion engine

## Science
### Chemistry

* Catenation, the bonding of atoms of the same element in a series, or chain
** Polymer chain, structure of a polymer
* Chain reaction, a sequence of reactions where a reactive product or by-product causes additional reactions
* Ideal chain, a mathematical model of polymer folding
* Worm-like chain, a model in polymer physics used to describe the behavior of semi-flexible polymers

### Other uses in science

* Electron transport chain, a sequence of chemical reactions yielding the transport of an electron through a membrane
* Food chain, a hierarchical or recursive list of predators and prey

## Sequences
### Geological features

* Archipelago, a chain of islands
* Crater chain, a line of craters on the surface of an astronomical body
* Mountain range, a chain of hills or mountains

### Other sequences

* Chain bridge, type of suspension bridge
* Chain crew, crew that manages signal poles in gridiron football
* Chain gang, group of prisoners chained together as a form of punishment
* Chain letter, a message that attempts to induce the recipient to make a number of copies of the message and then pass them on to one or more new recipients
* Chain of events, a number of actions and their effects that are linked together
* Chain smoking, practice of smoking several cigarettes/cigars in succession
* Chain stitch, in sewing and embroidery, a series of looped stitches that form a chain
* Chaining, a technique from applied behavioral analysis for teaching complicated tasks by breaking them into simpler steps
* Hudson River Chains, one of several chains used in blockades of the Hudson River
* Human chain (politics), a form of protest
* Signifying chain, in semiotics, an interlocking system of signifiers

## Measurement

* Chain (unit), a unit of length
* Gunter's chain, measuring instrument
* New York City Subway chaining, method to specify locations along the New York City Subway lines

## Other uses

* Chain (caste), a cultivating and fishing caste found in India
* Chains (nautical), small platforms on the sides of ships
* Fetter (Buddhism) (mental chain), a deeply rooted mental attachment preventing one from achieving liberation from suffering