An igneous intrusion is a form of geologic feature.

Intrusion may also refer to:

• Saltwater intrusion, the movement of saline into freshwater aquifers
• Intrusion (orthodontics), the movement of a tooth into bone
• Intrusion, an object on a page which causes a textual runaround (typography)
• Intrusion (play), an American play by Qurrat Ann Kadwani
• Intrusion (film), a 2021 American psychological thriller
• Intrusion (novel), a 2012 British sci-fi novel by Ken MacLeod

• All pages with titles containing intrusion
• Intruder (disambiguation)
• Intruders (disambiguation)
• Intruso (disambiguation)
• Extrusion