Adapter or adaptor may refer to:
Adapter a device used to match the physical or electrical characteristics of two different objects AC adapter, an electric power supply device Adapter (genetics), a small DNA molecule used in genetic engineering Adapter (rocketry), a segment between rocket stages Adapter (computing), used to connect various hardware devices Adapter (piping), a short length of pipe with two different ends Adapter pattern, a software design pattern used for computer programming Signal transducing adaptor protein, a type of protein involved in cell signalling Blank-firing adaptor, a device which enables automatic firearms to fire blanks Diving cylinder adapter, a diving accessory for interfacing different equipment Adapter, a type of hand movement in nonverbal communication
See also Gender of connectors and fasteners, relevant to adapters with male and female connections Coupling, a mechanical connection between two objects Electrical connector, often the subject of an electrical adapter