Skymark Airlines Inc. (スカイマーク株式会社, Sukaimāku Kabushiki-gaisha^?) : is a low-cost airline headquartered at Haneda Airport in Ōta, Tokyo, Japan, operating scheduled passenger services within Japan. In addition to its base at Haneda, Skymark is the dominant carrier at Kobe Airport and is the only domestic airline operating at Ibaraki Airport north of Tokyo.

Skymark was the first low-cost carrier established in Japan and is the only carrier offering domestic flights at Haneda Airport in competition with the duopoly of All Nippon Airways and Japan Airlines. Internet entrepreneur Shinichi Nishikubo controlled the company from 2003 to 2015, when the carrier filed for bankruptcy protection after attempting a fleet and service expansion. It remains the largest independent airline in Japan and the only independent low-cost carrier, as the other low-cost carriers in Japan are controlled by either ANA or JAL. In August 2015, Skymark creditors agreed to restructure the airline under the control of Japanese private equity fund Integral Corporation (50.1%), with minority investments from All Nippon Airways (16.5%), Sumitomo Mitsui Banking Corporation and the Development Bank of Japan (33.4%).

Skymark Airlines was founded in November 1996 as an independent domestic airline after deregulation of the Japanese airline industry and started operations on 19 September 1998. It was originally owned by a consortium of investors led by the travel agency H.I.S. and headed by H.I.S. president Hideo Sawada; another major early investor was the leasing company Orix. Its initial business plan called for it to be headquartered at Itami Airport in Osaka. Takashi Ide, former head of British Airways' operation in Japan, was hired as the company's CEO in 1998.

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