The Minolta Dynax 404si is a 35mm film SLR from Minolta's autofocus Dynax line, sold in the UK market during the late 1990s. It was positioned as an entry-level body aimed at first-time SLR buyers rather than enthusiasts.

At recent UK auction, hammer prices for the Dynax 404si have landed in the £19–£38 range, with the two recorded results sitting either side of roughly £29. Values today are modest because the camera was a budget model in its day and supply at saleroom level comfortably meets demand; condition and inclusion of a working lens are the main swing factors on what a 404si sells for.