In dyeing procedures using disperse dyes on hydrophobic fibers such as polyester, the role of dispersing agents is especially very significant.[22] The main interest is the characteristic behaviors of dispersing agents which give a good level of dyeing and increase the dye fastness on fibers.[1] Main functionalities of the dispersing agents utilized in dyeing can be sorted out in four aspects: (1) as a surface active compound namely dissolution, dispersing and wetting agent; (2) as a fiber affinity compound, similar to a colorless dye; (3) as a dye affinity compound; and (4) as both fiber and dye affinity compound.[1,14] In order to reorganize the roles of dispersing agents in dyeing, it is essential to investigate important factors in stability of dispersions of disperse dyes. In this research, various formulations of disperse dyes containing different dispersing agents, b-cyclodextrin, wetting agent, and urea were prepared. Moreover, the stability of prepared dispersions was studied. The stability of dye dispersions was investigated by several methods such as the dye residue on the filter papers, centrifuging, and turbidity.