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Disperse dyes are a class of water-insoluble dyes that penetrate synthetic fibers and are held in place by physical forces without forming chemical bonds, and they can be applied as organic colorants with no ionizing groups, low water solubility, and suitability for dyeing hydrophobic fibers. Their molecular size is the smallest of all dyes.

Dispersible dyes are usually sold in powder form. They are prepared by milling the press cake with an equal weight of a suitable auxiliary product and a little water, drying it, and then mixing it with a diluent to obtain a product containing 15-40% dye. The very fine particle size provides a large surface area that aids in dissolution and allows for fiber uptake. Disperse dyes are also used for sublimation printing on synthetic fibers and are used as colorants in the manufacture of "iron-on" transfer crayons and inks.