AirAsia Japan Co., Ltd (エアアジア・ジャパン株式会社 Eāajia Japan Kabushiki-Gaisha) is the name of two incarnations of Japanese low-cost airline, operating as a joint venture between AirAsia of Malaysia and Japanese partners.

The director of AirAsia Tony Fernandes dubbed the two incarnations of AirAsia Japan as "Part 1" and "Part 2".

Malaysian low-cost airline AirAsia and Japanese network airline All Nippon Airways announced their joint venture at a press conference in Tokyo on 21 July 2011. Following its formal establishment in August 2011, the first flight for the airline was on 1 August 2012, from Tokyo Narita to Fukuoka.

The airline was headquartered alongside ANA in Tokyo, with its main operating base at Narita International Airport, and initially served domestic destinations utilising the brand and service model of AirAsia. Future planned international destinations included the Philippines, South Korea and Taiwan. AirAsia CEO Tony Fernandes also indicated that the joint venture hub at Narita may serve as a connecting point between Southeast Asia and the United States within the AirAsia group network.

AirAsia Japan was the first low-cost airline to be based at Narita. Its formation was announced only months after ANA had announced the formation of Peach, a low-cost airline based at Kansai International Airport in Osaka, and alongside a concurrent effort by Japan Airlines to set up a low-cost affiliate. ANA elected to partner with an existing low-cost airline for efficiency and strategic advantage.

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