Kiso Kan-Zai Market Cooperative is a regional forestry and timber organization based in the Kiso area of Nagano, Japan, known as the origin of Kiso hinoki cypress. It promotes the use of local timber while supporting forest conservation and the transfer of healthy, productive forests to future generations. Its featured regional brands include mature Kiso hinoki, including timber identified as national forest material, and Shinshu Premium larch.

The cooperative connects timber producers and buyers through regular log auctions and timber markets at its Ogiwara and Sakashita sites. Its website provides auction schedules, listings, bidding details, and results, helping customers explore available timber and timber products. The cooperative also offers information and consultation for purchasing or using branded regional wood, and promotes its application in homebuilding, woodworking, furniture, and everyday tools.

Alongside sales, it shares guidance on the characteristics and uses of Kiso timber, regional forest resources, and responsible wood use. Its activities support wider use of domestic timber, sustainable forest management, and the vitality of the local forestry industry.