A thermal inkjet dye sublimation ink consists of a disperse dye colorant dispersion, a co-solvent system, an additive, and a balance of water. The colorant dispersion is present in an amount ranging from about 1 wt % actives to about 7 wt % actives. The co-solvent system is present in a total amount ranging from about 12 wt % to about 25 wt %. The co-solvent system consists of glycerol present in an amount ranging from about 9 wt % to about 16 wt %, ethoxylated glycerol present in an amount ranging from 0 wt % to about 5 wt %, and a water soluble or water miscible organic solvent present in an amount ranging from 0 wt % to about 7 wt %. The additive is selected from the group consisting of a surfactant, a chelating agent, a buffer, a biocide, and combinations thereof.