Dux (Latin for "leader") was also another name for a Roman miltary commander; usually, a general who commanded multiple legions without also being a governor. It was often a prefix for dux bellorum (literally, "leader of wars") or dux provinciae (literally, "leader of a province"). It is the source of the modern duke, and is often Anglicized as such.

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Dux is a title awarded to the top graduate in some schools, particularly in Scotland, Australia and New Zealand.

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Dux was a Swedish subsidiary of Philips, originally an independent company that produced radios in the 1970s.