Pin may refer to:

• Pin (device), device used for fastening objects or material together.
• Bridge pin, a vertical wire on the bridge of keyboard instruments such as the piano and harpsichord that is used to control the string resonances
• Brooch, a decorative item fastened on apparels, may be called a pin
• Badge or button, in the U.S. referred to as a pin, a small (usually round) piece of metal or plastic with a pin attached, usually worn on clothing
• In electronics a pin is an electric interconnection. For example a metal wire coming out of an Integrated circuit or Transistor
• In Computer Science, Pin is a tool for dynamic instrumentation, provided by Intel ^*
• In firearms, the firing pin is a nail-like device to transfer hammer energy to the primer of ammunition
• Pin, a commune of the Haute-Saône département, in France
• Operation Pin is an international policing initiative to find pedophiles using the internet to access child pornography
• Pin... Pin..., a 1988 cult horror movie

In sports and strategy games pin may refer to:

• Pin (chess) refers to a scenario where if a lesser piece is under attack and moves away, it would reveal a more valuable piece
• Pin (wrestling) is a way of winning a match
• In grappling, a pinning hold is a hold used to control an opponent
• Bowling pins, which must be knocked down by the bowling ball

PIN may stand for:

• Personal identification number
• Postal Index Number (India)
• Personal Internet Name RFC 3043 ^*
• Prostatic intraepithelial neoplasia
• PIN diode (p-type, intrinsic, n-type diode), a type of photodiode

PIN | Pin | ピン | Pin