An invasion is a military offensive in which large parts of combatants of one geopolitical entity aggressively enter territory controlled by another such entity, generally with the objective of either conquering, liberating or re-establishing control or authority over a territory, forcing the partition of a country, altering the established government or gaining concessions from said government, or a combination thereof. An invasion can be the cause of a war, be a part of a larger strategy to end a war, or it can constitute an entire war in itself. Due to the large scale of the operations associated with invasions, they are usually strategic in planning and execution.

Invasión is an Argentine film released in 1969 and directed by Hugo Santiago. It is an example of an inter phase between the classic cinema and nouvelle vague of French style.

Invasion! can refer to either of two comic book related events:

• Invasion! (2000 AD)
• Invasion! (DC Comics)

Invasion (also typeset as InVasion) was a professional wrestling pay-per-view event produced by the then World Wrestling Federation (now World Wrestling Entertainment) (WWF/WWE) and presented by PlayStation. It took place on July 22, 2001 at the Gund Arena in Cleveland, Ohio. This event was originally planned to be called Fully Loaded 2001, as it was advertised at the King of the Ring 2001 event, which immediately preceded Invasion.