The Canon EOS-1D Mark IV is a professional digital SLR introduced by Canon in 2009 as part of the EOS-1D line of APS-H format sports and news cameras. It uses the Canon EF lens mount and was positioned at the top of Canon's professional DSLR range when new.

UK auction hammer prices for the EOS-1D Mark IV are wholesale levels, not retail asking figures, and the dataset is thin: a single recorded sale at £140 in June 2024 is the only reference point. With just one data point, today's market value is best read as indicative rather than definitive, and clean, low-shutter-count bodies would likely sell for more than a heavily used example.