Knocking or Knockin or Knockin' may refer to:
- Knocking, Austria, a hamlet, subdivision of Erlauf (municipality) in Austria
- Knocking (2006 film), a documentary about Jehovah's Witnesses
- Knocking (2021 film), a Swedish thriller film
- "Knockin'" (song), by Spanish band Double Vision (1995)
- Engine knocking, or the sound accompanying automotive combustion malfunction
- Port knocking, a covert method of opening a port on a server
- Roof knocking, a bombing practice of the Israeli Defense Forces
- Gene knockin, genetic engineering method
- Knockin Castle, castle situated in the village of Knockin on Shropshire between Oswestry and Shrewsbury
See also
- Knock (disambiguation)
- Knockin' on Heaven's Door (disambiguation)
- The Knocking, a 2022 Finnish horror film
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