The Mamiya 35 I is a 35mm rangefinder camera produced by Mamiya in Japan. It belongs to the brand's mid-twentieth-century 35mm rangefinder line, positioned as a compact viewfinder camera for general photography.

With only two recorded UK auction hammer results on file (2003 and 2018), pricing data for the Mamiya 35 I is thin: those sales fell between roughly £500 and £680, which gives a midpoint near £590. Today the model trades infrequently enough that any current value estimate is indicative rather than firm, and condition of the shutter, rangefinder patch and lens glass will sell for a wide spread around that figure.