Plug, PLUG, plugs, or plugged may refer to:
- Plug, an insertive closure or stopper (plug)
- Core plug, used to fill the casting holes on engines
- Butt plug, a sex toy that is inserted into the rectum
- Earplug for ear protection
- Plug (sanitation), a stopper for a drainage outlet
- Plug (accounting), an unsupported adjustment to an accounting record
- Plug (fishing), a family of fishing lures
- Plug (horticulture), a planting technique
- Plug (jewellery), a type of jewellery worn in stretched piercings
- Fusible plug, a safety device in steam boilers
- Hair plug, hair that has undergone hair transplantation
- Mating plug, secretion used in the mating of some animal species
- Plug, a step in the manufacturing process for parts made of carbon-fiber-reinforced polymer
- Plug, a type of chewing tobacco made by pressing tobacco with syrup
- Plug, the central element of a Plug and feathers, a tool for splitting stone
- Plug computer, a type of small-form-factor computer
- Portland Linux/Unix Group (PLUG), a group of Linux enthusiasts in Portland, Oregon
- Product plug, or product placement in marketing
- Volcanic plug, a geological landform
- Wall plug, a fastener that allows screws to be fitted into drywall or masonry walls
- Plug (plumbing)
- Plug, a worthless horse