Invasion Attack 2015 was a professional wrestling pay-per-view (PPV) promoted by New Japan Pro Wrestling (NJPW). The event took place on April 5, 2015, in Tokyo at Ryōgoku Kokugikan and featured nine matches, four of which were contested for championships. In addition to airing worldwide through NJPW's internet streaming site, New Japan Pro Wrestling World, the event also aired in Japan as a regular PPV through SKY PerfecTV!'s Sukachan service. It was the third event under the Invasion Attack name.

The event sold out in advance, making it the fastest non-G1 Climax or non-special show to sell out Ryōgoku Kokugikan in more than a decade. Dave Meltzer of the Wrestling Observer Newsletter noted that this spoke volumes as the card was in his mind "not all that loaded" and that none of the "big three" (Hiroshi Tanahashi, Kazuchika Okada, Shinsuke Nakamura) were in the main event. During the event, NJPW experienced technical difficulties with its New Japan Pro Wrestling World streaming site, leading to many paying viewers worldwide unable to view the event live. NJPW issued an apology for the problems. It was later reported that the problem was caused by an "outside hacker".

Invasion Attack 2015 featured nine professional wrestling matches that involved different wrestlers from pre-existing scripted feuds and storylines. Wrestlers portrayed villains, heroes, or less distinguishable characters in the scripted events that built tension and culminated in a wrestling match or series of matches.

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