The East Asian snowstorms of 2009–2010 were heavy winter storms, including blizzards, ice storms, and other winter events, that affected East Asia from 8 May 2009 to 28 February 2010. The areas affected included Mongolia, China, Nepal, the Korean Peninsula, Japan, Kuril Islands, Sea of Okhotsk, Primorsky, and Sakhalin Island.

A blizzard is a severe snowstorm characterized by strong sustained winds and low visibility, lasting for a prolonged period of time—typically at least three or four hours. A ground blizzard is a weather condition where snow is not falling but loose snow on the ground is lifted and blown by strong winds. Blizzards can have an immense size and usually stretch to hundreds or thousands of kilometres.