The Diamond DV20/DA20 Katana is an Austrian-designed two-seat general aviation light aircraft. Developed and manufactured by Diamond Aircraft, it was originally produced in Austria as the DV20.

Diamond Aircraft Industries is a European manufacturer of general aviation aircraft and motor gliders, based in Austria. It has been a subsidiary of the Chinese company Wanfeng Aviation since 2017. It is the third largest manufacturer of aircraft for the general aviation sector, and has manufacturing facilities in Wiener Neustadt, Lower Austria, and in London, Ontario, Canada, as well as further production lines operated as joint ventures in other nations, such as China.