Hokkaido Air System Co., Ltd. (株式会社北海道エアシステム, Kabushiki-gaisha Hokkaidō Ea Shisutemu^?), or HAC, is an airline with its headquarters on the property of Okadama Airport in Okadama-chō, Higashi-ku, Sapporo. It operates scheduled domestic services in Hokkaidō. Its main base of operations is Okadama Airport.

Hokkaido Air System is a private company with sixty shareholders, the largest of which are the Hokkaido government (36.5%), Japan Airlines (14.5%) and the city of Sapporo (13.5%). Other shareholders include the city of Hakodate, the city of Kushiro, Hokkaido Electric Power Company, Hokkaido Bank and North Pacific Bank. The company had 93 employees at 30 June 2015.

The airline was established in 1997 and started operations in 1998. Founded as a joint venture, it was an affiliate of Japan Air System until that airline consolidated into Japan Airlines. Its headquarters were at one time located in the Terminal Building of New Chitose Airport in Chitose, Hokkaidō, Japan.

HAC's initial routes in 1998 were Chitose-Hakodate, Hakodate-Asahikawa, Hakodate-Kushiro and Asahikawa-Kushiro, followed by Chitose-Kushiro and Hakodate-Memanbetsu in 1999 and Hakodate-Sendai in 2001. It began Okadama service in 2003 with service to Hakodate and Kushiro, for a total of nine routes. HAC also served Monbetsu from Chitose and Okadama in 2005-06.Air Hokkaido ceased operations on 31 March 2006 and its sole route, Hakodate-Okushiri, was taken over the next day by Hokkaido Air System.

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