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[edit]

• Knock (disambiguation)
• Knockin' on Heaven's Door (disambiguation)
• The Knocking, a 2022 Finnish horror film