Process for the production of colored polyurethane foams

In a process for producing a colored polyurethane foam wherein a polyether or a polyester is reacted with an organic polyisocyanate to produce a polyurethane foam, the improvement which comprises adding to the reactants of the polyurethane foam production before or during the reaction a dispersion of one or more dyes each of which contains at least one free amino or hydroxyl group capable of reaction with isocyanates under the conditions of polyaddition and liquids in which the dyes are soluble to an extent of less than 2% at 20.degree.C.