The Kodak Duo Six-20 is a folding roll-film camera that takes 6×4.5 cm exposures on 620 film. It was introduced in the 1930s and sat in the mid-tier of Kodak's pre-war folder range, smaller and more compact than the 6×9 Six-20 models.

Auction data for the Duo Six-20 is thin: the only verified UK saleroom hammer result on file is £34, achieved at Christie's. With just one data point, it is difficult to state today what a typical Duo Six-20 sells for, though clean, working examples with a clear lens and functioning shutter tend to command more than this figure at auction.