The Adox 300 is a 35mm viewfinder camera produced by the West German maker Adox Kamerawerk. It dates to the mid-1950s and was positioned as a compact rangefinder-style still camera for amateur use.

At UK auction in 2025, hammer prices for the Adox 300 ranged from about £25 to £80, with the two recorded results sitting either side of a roughly £50 midpoint. As of 2026 the model trades as a low-value collector item at saleroom level, and what an example is worth today depends heavily on cosmetic condition and whether the shutter and film transport are working.