Look up adder or Adder in Wiktionary, the free dictionary.

Vipera berus, the common European adder, is a snake found in Europe and northern Asia.

Adder may also refer to:

• AA-12 Adder, a Russian air-to-air missile
• Adder (electronics), an electronic circuit designed to do addition
• Adder Technology, a manufacturing company
• Armstrong Siddeley Adder, a late 1940s British turbojet engine
• Blackadder, a series of BBC sitcoms
• Golden Axe: The Revenge of Death Adder, a video game
• HMS Adder, any of seven ships of the Royal Navy
• Any of several groups of venomous snakes
• USS Adder, a US submarine

• Addition, a mathematical operation

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