The viscosities eta of some monosaccharides, their methyl- and deoxy- derivatives, disaccharides, and trisaccharides have been measured in (0.25, 0.5, 1.0, and 1.25) mol.kg(-1) aqueous solutions of potassium phosphate (KH2PO4) and (0.5, 1.0, 1.5, and 2.0) mol.kg(-1) aqueous solutions of sodium phosphate (NaH2PO4) and ammonium phosphate (NH4H2PO4) monobasic salts, and potassium phosphate (K3PO4) tribasic salt over the temperature range (288.15 to 318.15) K and at atmospheric pressure, P = 0.1 MPa. The viscosity data have been utilized to calculate the Jones-Dole viscosity B-coefficients and their corresponding coefficients of transfer, Delta B-t. The Delta B-t values were found to be positive and their magnitudes vary depending on the nature of solutes and cosolutes. The dB/dT coefficients and pair eta(AB) and triplet eta(ABB) interaction coefficients have also been calculated and discussed in terms of solute-solvent/cosolute interactions. The results have been compared in phosphate-based salts on the basis of the nature of the cation and anion.