Chain may refer to:

• Daisy chain, originally a garland of flowers, but could relate to some of the applications below:

In structures:

• Chain Bridge (Washington, D.C.), bridge across the Potomac River at the Little Falls in Washington, D.C.
• Chain link fencing, type of fencing that utilizes vertical wires that are bent in a zig zag fashion and linked to each other
• Széchenyi Chain Bridge, suspension bridge that spans River Danube between Buda and Pest
• Chain bridge, bridge in Northumberland

In mechanical devices:

• Snow chains, useed to improve traction in snow
• Chain drive, was the main feature which differentiated the safety bicycle
• Bicycle chain, chain that transfers power from the pedals to the drive-wheel of a bicycle thus propelling it
• Chain, the shape of a hanging flexible cable when supported at its ends and acted upon by a uniform gravitational force
• Chain gun, type of machine gun that utilizes a chain, driven by an external power source, to actuate the mechanism rather than using recoil
• Chain pumps, type of water pump where an endless chain has positioned on it a series of circular discs
• Chain-linked Lewis, lifting device made from two curved steel legs
• Chainsaw, portable mechanical, motorized saw
• Flat chain, form of chain used chiefly in agricultural machinery
• Keychain, a small chain that connects a small item to a keyring
• Roller chain, the type of chain most commonly used for transmission of mechanical power on bicycles, motorcycles, and in industrial and agricultural machinery
• Timing chain to regulate the valve and ignition timing on an internal combustion engine

In security:

• Ball and chain, phrase that can refer to either the actual restraint device that was used to slow down prisoners, or a derogatory description of a person's significant other
• bicycle chain, lockable chain

In management:

• Business chain, network of physical business locations
• Chain of command, the line of authority and responsibility along which orders are passed
• Chain store, range of retail outlets which share a brand and central management
• Cold chain, temperature-controlled supply chain
• Hotel chain, group of branded hotels managed together under a business arrangement known as franchising or operated by a single company
• Restaurant chain, set of related restaurants
• Supply chain, 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

In mathematics:

• Chain (algebraic topology), formal linear combination of k-simplices
• Chain (order theory), totally ordered subset of a partially ordered set
• Markov chain, discrete-time stochastic process with the Markov property

In chemistry:

• Chain reaction, sequence of reactions where a reactive product or by-product causes additional reactions
• Ideal chain, mathematical model of polymer folding

In other fields:

• Chain stitch,in sewing and embroidery, a chain stitch is a series of looped stitches that form a chain.
• Chain, Planetary, a chain of globes serving as fields of evolution in theosophical cosmology
• Chain (unit), unit of length
• Chain letter, 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 office, collar or heavy gold chain worn as insignia of office or a mark of fealty in medieval Europe and the United Kingdom
• Chain of events, as depicted on film which has holes to engage a sprocket like a chain does
• Chain smoking, the habit of smoking continuously
• Chain tool, small mechanical device used to "break" a bicycle chain in such a way that it could be mended with the same tool
• Chainmail, a type of armor made of interlocking chain links
• Chains (song), a song performed by the Beatles
• Gunter's chain, geodetic system
• Human chain, a form of protest
• Karate sticks linked by a chain
• Toilet chain, used to operate valve contained inside cistern to flush early toilets

Kette | Ĉeno | Chaîne | שרשרת (פירושונים) | チェーン | Lenkje | Łańcuch | Chain | Kedja